syscall: add explicit build tags

Auto-generated using the following bash script:
for i in z*_*_*.go; do
        goosgoarch=`basename ${i/${i/_*/}_/} .go`
        goos=${goosgoarch/_*/}
        goarch=${goosgoarch/*_/}
        echo $i $goos $goarch
        [ "$goos" = "windows" ] && continue
        sed -i -e "/^package /i\/\/ +build $goarch,$goos\n" "$i"
done

Change-Id: I756fee551d1698080e4591fed8f058ae0450aaa5
Signed-off-by: Shenghou Ma <minux@golang.org>
Reviewed-on: https://go-review.googlesource.com/10113Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/syscall/zerrors_darwin_386.go

@@ -4,6 +4,8 @@
 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs -- -m32 _const.go
 
+// +build 386,darwin
+
 package syscall
 
 const (

src/syscall/zerrors_darwin_amd64.go

@@ -4,6 +4,8 @@
 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs -- -m64 _const.go
 
+// +build amd64,darwin
+
 package syscall
 
 const (

src/syscall/zerrors_darwin_arm.go

@@ -4,6 +4,8 @@
 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs -- _const.go
 
+// +build arm,darwin
+
 package syscall
 
 const (

src/syscall/zerrors_darwin_arm64.go

@@ -4,6 +4,8 @@
 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs -- -m64 _const.go
 
+// +build arm64,darwin
+
 package syscall
 
 const (

src/syscall/zerrors_dragonfly_amd64.go

@@ -4,6 +4,8 @@
 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs -- -m64 _const.go
 
+// +build amd64,dragonfly
+
 package syscall
 
 const (

src/syscall/zerrors_freebsd_386.go

@@ -4,6 +4,8 @@
 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs -- -m32 _const.go
 
+// +build 386,freebsd
+
 package syscall
 
 const (

src/syscall/zerrors_freebsd_amd64.go

@@ -4,6 +4,8 @@
 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs -- -m64 _const.go
 
+// +build amd64,freebsd
+
 package syscall
 
 const (

src/syscall/zerrors_freebsd_arm.go

@@ -4,6 +4,8 @@
 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs -- _const.go
 
+// +build arm,freebsd
+
 package syscall
 
 const (

src/syscall/zerrors_linux_386.go

@@ -4,6 +4,8 @@
 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs -- -m32 _const.go
 
+// +build 386,linux
+
 package syscall
 
 const (

src/syscall/zerrors_linux_amd64.go

@@ -4,6 +4,8 @@
 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs -- -m64 _const.go
 
+// +build amd64,linux
+
 package syscall
 
 const (

src/syscall/zerrors_linux_arm.go

@@ -4,6 +4,8 @@
 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs -- _const.go
 
+// +build arm,linux
+
 package syscall
 
 const (

src/syscall/zerrors_linux_arm64.go

@@ -4,6 +4,8 @@
 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs -- _const.go
 
+// +build arm64,linux
+
 package syscall
 
 const (

src/syscall/zerrors_linux_ppc64.go

@@ -4,6 +4,8 @@
 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs -- -m64 _const.go
 
+// +build ppc64,linux
+
 package syscall
 
 const (

src/syscall/zerrors_linux_ppc64le.go

@@ -4,6 +4,8 @@
 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs -- -m64 _const.go
 
+// +build ppc64le,linux
+
 package syscall
 
 const (

src/syscall/zerrors_netbsd_386.go

@@ -4,6 +4,8 @@
 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs -- -m32 _const.go
 
+// +build 386,netbsd
+
 package syscall
 
 const (

src/syscall/zerrors_netbsd_amd64.go

@@ -4,6 +4,8 @@
 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs -- -m64 _const.go
 
+// +build amd64,netbsd
+
 package syscall
 
 const (

src/syscall/zerrors_netbsd_arm.go

@@ -4,6 +4,8 @@
 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs -- -marm _const.go
 
+// +build arm,netbsd
+
 package syscall
 
 const (

src/syscall/zerrors_openbsd_386.go

@@ -4,6 +4,8 @@
 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs -- -m32 _const.go
 
+// +build 386,openbsd
+
 package syscall
 
 const (

src/syscall/zerrors_openbsd_amd64.go

@@ -4,6 +4,8 @@
 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs -- -m64 _const.go
 
+// +build amd64,openbsd
+
 package syscall
 
 const (

src/syscall/zerrors_openbsd_arm.go

@@ -4,6 +4,8 @@
 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs -- _const.go
 
+// +build arm,openbsd
+
 package syscall
 
 const (

src/syscall/zerrors_solaris_amd64.go

@@ -4,6 +4,8 @@
 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs -- -m64 _const.go
 
+// +build amd64,solaris
+
 package syscall
 
 const (

src/syscall/zsyscall_darwin_386.go

 // mksyscall.pl -l32 syscall_bsd.go syscall_darwin.go syscall_darwin_386.go
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
 
+// +build 386,darwin
+
 package syscall
 
 import "unsafe"

src/syscall/zsyscall_darwin_amd64.go

 // mksyscall.pl syscall_bsd.go syscall_darwin.go syscall_darwin_amd64.go
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
 
+// +build amd64,darwin
+
 package syscall
 
 import "unsafe"

src/syscall/zsyscall_darwin_arm.go

 // mksyscall.pl -l32 syscall_bsd.go syscall_darwin.go syscall_darwin_arm.go
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
 
+// +build arm,darwin
+
 package syscall
 
 import "unsafe"

src/syscall/zsyscall_darwin_arm64.go

 // mksyscall.pl syscall_bsd.go syscall_darwin.go syscall_darwin_arm64.go
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
 
+// +build arm64,darwin
+
 package syscall
 
 import "unsafe"

src/syscall/zsyscall_dragonfly_amd64.go

 // mksyscall.pl -dragonfly syscall_bsd.go syscall_dragonfly.go syscall_dragonfly_amd64.go
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
 
+// +build amd64,dragonfly
+
 package syscall
 
 import "unsafe"

src/syscall/zsyscall_freebsd_386.go

 // mksyscall.pl -l32 syscall_bsd.go syscall_freebsd.go syscall_freebsd_386.go
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
 
+// +build 386,freebsd
+
 package syscall
 
 import "unsafe"

src/syscall/zsyscall_freebsd_amd64.go

 // mksyscall.pl syscall_bsd.go syscall_freebsd.go syscall_freebsd_amd64.go
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
 
+// +build amd64,freebsd
+
 package syscall
 
 import "unsafe"

src/syscall/zsyscall_freebsd_arm.go

 // mksyscall.pl -l32 -arm syscall_bsd.go syscall_freebsd.go syscall_freebsd_arm.go
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
 
+// +build arm,freebsd
+
 package syscall
 
 import "unsafe"

src/syscall/zsyscall_linux_386.go

 // mksyscall.pl -l32 syscall_linux.go syscall_linux_386.go
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
 
+// +build 386,linux
+
 package syscall
 
 import "unsafe"

src/syscall/zsyscall_linux_amd64.go

 // mksyscall.pl syscall_linux.go syscall_linux_amd64.go
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
 
+// +build amd64,linux
+
 package syscall
 
 import "unsafe"

src/syscall/zsyscall_linux_arm.go

 // mksyscall.pl -l32 -arm syscall_linux.go syscall_linux_arm.go
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
 
+// +build arm,linux
+
 package syscall
 
 import "unsafe"

src/syscall/zsyscall_linux_arm64.go

 // mksyscall.pl syscall_linux.go syscall_linux_arm64.go
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
 
+// +build arm64,linux
+
 package syscall
 
 import "unsafe"

src/syscall/zsyscall_linux_ppc64.go

 // mksyscall.pl syscall_linux.go syscall_linux_ppc64x.go
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
 
+// +build ppc64,linux
+
 package syscall
 
 import "unsafe"

src/syscall/zsyscall_linux_ppc64le.go

 // mksyscall.pl syscall_linux.go syscall_linux_ppc64x.go
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
 
+// +build ppc64le,linux
+
 package syscall
 
 import "unsafe"

src/syscall/zsyscall_nacl_386.go

 // mksyscall.pl -l32 -nacl syscall_nacl.go syscall_nacl_386.go
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
 
+// +build 386,nacl
+
 package syscall
 
 import "unsafe"

src/syscall/zsyscall_nacl_amd64p32.go

 // mksyscall.pl -nacl syscall_nacl.go syscall_nacl_amd64p32.go
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
 
+// +build amd64p32,nacl
+
 package syscall
 
 import "unsafe"

src/syscall/zsyscall_nacl_arm.go

 // mksyscall.pl -l32 -nacl -arm syscall_nacl.go syscall_nacl_arm.go
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
 
+// +build arm,nacl
+
 package syscall
 
 import "unsafe"

src/syscall/zsyscall_netbsd_386.go

 // mksyscall.pl -l32 -netbsd syscall_bsd.go syscall_netbsd.go syscall_netbsd_386.go
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
 
+// +build 386,netbsd
+
 package syscall
 
 import "unsafe"

src/syscall/zsyscall_netbsd_amd64.go

 // mksyscall.pl -netbsd syscall_bsd.go syscall_netbsd.go syscall_netbsd_amd64.go
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
 
+// +build amd64,netbsd
+
 package syscall
 
 import "unsafe"

src/syscall/zsyscall_netbsd_arm.go

 // mksyscall.pl -l32 -arm syscall_bsd.go syscall_netbsd.go syscall_netbsd_arm.go
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
 
+// +build arm,netbsd
+
 package syscall
 
 import "unsafe"

src/syscall/zsyscall_openbsd_386.go

 // mksyscall.pl -l32 -openbsd syscall_bsd.go syscall_openbsd.go syscall_openbsd_386.go
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
 
+// +build 386,openbsd
+
 package syscall
 
 import "unsafe"

src/syscall/zsyscall_openbsd_amd64.go

 // mksyscall.pl -openbsd syscall_bsd.go syscall_openbsd.go syscall_openbsd_amd64.go
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
 
+// +build amd64,openbsd
+
 package syscall
 
 import "unsafe"

src/syscall/zsyscall_openbsd_arm.go

 // mksyscall.pl -l32 -openbsd -arm syscall_bsd.go syscall_openbsd.go syscall_openbsd_arm.go
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
 
+// +build arm,openbsd
+
 package syscall
 
 import "unsafe"

src/syscall/zsyscall_plan9_386.go

 // mksyscall.pl -l32 -plan9 syscall_plan9.go
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
 
+// +build 386,plan9
+
 package syscall
 
 import "unsafe"

src/syscall/zsyscall_plan9_amd64.go

 // mksyscall.pl -l32 -plan9 syscall_plan9.go
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
 
+// +build amd64,plan9
+
 package syscall
 
 import "unsafe"

src/syscall/zsyscall_solaris_amd64.go

 // mksyscall_solaris.pl syscall_solaris.go syscall_solaris_amd64.go
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
 
+// +build amd64,solaris
+
 package syscall
 
 import "unsafe"

src/syscall/zsysnum_darwin_386.go

 // mksysnum_darwin.pl /usr/include/sys/syscall.h
 // MACHINE GENERATED BY THE ABOVE COMMAND; DO NOT EDIT
 
+// +build 386,darwin
+
 package syscall
 
 const (

src/syscall/zsysnum_darwin_amd64.go

 // mksysnum_darwin.pl /usr/include/sys/syscall.h
 // MACHINE GENERATED BY THE ABOVE COMMAND; DO NOT EDIT
 
+// +build amd64,darwin
+
 package syscall
 
 const (

src/syscall/zsysnum_darwin_arm.go

 // mksysnum_darwin.pl /usr/include/sys/syscall.h
 // MACHINE GENERATED BY THE ABOVE COMMAND; DO NOT EDIT
 
+// +build arm,darwin
+
 package syscall
 
 const (

src/syscall/zsysnum_darwin_arm64.go

 // mksysnum_darwin.pl /usr/include/sys/syscall.h
 // MACHINE GENERATED BY THE ABOVE COMMAND; DO NOT EDIT
 
+// +build arm64,darwin
+
 package syscall
 
 const (

src/syscall/zsysnum_dragonfly_amd64.go

 // mksysnum_dragonfly.pl
 // MACHINE GENERATED BY THE ABOVE COMMAND; DO NOT EDIT
 
+// +build amd64,dragonfly
+
 package syscall
 
 const (

src/syscall/zsysnum_freebsd_386.go

 // mksysnum_freebsd.pl
 // MACHINE GENERATED BY THE ABOVE COMMAND; DO NOT EDIT
 
+// +build 386,freebsd
+
 package syscall
 
 const (

src/syscall/zsysnum_freebsd_amd64.go

 // mksysnum_freebsd.pl
 // MACHINE GENERATED BY THE ABOVE COMMAND; DO NOT EDIT
 
+// +build amd64,freebsd
+
 package syscall
 
 const (

src/syscall/zsysnum_freebsd_arm.go

 // mksysnum_freebsd.pl
 // MACHINE GENERATED BY THE ABOVE COMMAND; DO NOT EDIT
 
+// +build arm,freebsd
+
 package syscall
 
 const (

src/syscall/zsysnum_linux_386.go

 // mksysnum_linux.pl /usr/include/asm/unistd_32.h
 // MACHINE GENERATED BY THE ABOVE COMMAND; DO NOT EDIT
 
+// +build 386,linux
+
 package syscall
 
 const (

src/syscall/zsysnum_linux_amd64.go

 // mksysnum_linux.pl /usr/include/asm/unistd_64.h
 // MACHINE GENERATED BY THE ABOVE COMMAND; DO NOT EDIT
 
+// +build amd64,linux
+
 package syscall
 
 const (

src/syscall/zsysnum_linux_arm.go

 // mksysnum_linux.pl
 // MACHINE GENERATED BY THE ABOVE COMMAND; DO NOT EDIT
 
+// +build arm,linux
+
 package syscall
 
 const (

src/syscall/zsysnum_linux_arm64.go

 // mksysnum_linux.pl /usr/include/asm-generic/unistd.h
 // MACHINE GENERATED BY THE ABOVE COMMAND; DO NOT EDIT
 
+// +build arm64,linux
+
 package syscall
 
 const (

src/syscall/zsysnum_linux_ppc64.go

 // mksysnum_linux.pl /usr/include/asm/unistd.h
 // MACHINE GENERATED BY THE ABOVE COMMAND; DO NOT EDIT
 
+// +build ppc64,linux
+
 package syscall
 
 const (

src/syscall/zsysnum_linux_ppc64le.go

 // mksysnum_linux.pl /usr/include/powerpc64le-linux-gnu/asm/unistd.h
 // MACHINE GENERATED BY THE ABOVE COMMAND; DO NOT EDIT
 
+// +build ppc64le,linux
+
 package syscall
 
 const (

src/syscall/zsysnum_netbsd_386.go

 // mksysnum_netbsd.pl
 // MACHINE GENERATED BY THE ABOVE COMMAND; DO NOT EDIT
 
+// +build 386,netbsd
+
 package syscall
 
 const (

src/syscall/zsysnum_netbsd_amd64.go

 // mksysnum_netbsd.pl
 // MACHINE GENERATED BY THE ABOVE COMMAND; DO NOT EDIT
 
+// +build amd64,netbsd
+
 package syscall
 
 const (

src/syscall/zsysnum_netbsd_arm.go

 // mksysnum_netbsd.pl
 // MACHINE GENERATED BY THE ABOVE COMMAND; DO NOT EDIT
 
+// +build arm,netbsd
+
 package syscall
 
 const (

src/syscall/zsysnum_openbsd_386.go

 // mksysnum_openbsd.pl
 // MACHINE GENERATED BY THE ABOVE COMMAND; DO NOT EDIT
 
+// +build 386,openbsd
+
 package syscall
 
 const (

src/syscall/zsysnum_openbsd_amd64.go

 // mksysnum_openbsd.pl
 // MACHINE GENERATED BY THE ABOVE COMMAND; DO NOT EDIT
 
+// +build amd64,openbsd
+
 package syscall
 
 const (

src/syscall/zsysnum_openbsd_arm.go

 // mksysnum_openbsd.pl
 // MACHINE GENERATED BY THE ABOVE COMMAND; DO NOT EDIT
 
+// +build arm,openbsd
+
 package syscall
 
 const (

src/syscall/zsysnum_solaris_amd64.go

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build amd64,solaris
+
 package syscall
 
 // TODO(aram): remove these before Go 1.3.

src/syscall/ztypes_darwin_386.go

 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs types_darwin.go
 
+// +build 386,darwin
+
 package syscall
 
 const (

src/syscall/ztypes_darwin_amd64.go

 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs types_darwin.go
 
+// +build amd64,darwin
+
 package syscall
 
 const (

src/syscall/ztypes_darwin_arm.go

@@ -2,6 +2,8 @@
 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs types_darwin.go
 
+// +build arm,darwin
+
 package syscall
 
 const (

src/syscall/ztypes_darwin_arm64.go

 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs types_darwin.go
 
+// +build arm64,darwin
+
 package syscall
 
 const (

src/syscall/ztypes_dragonfly_amd64.go

 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs types_dragonfly.go
 
+// +build amd64,dragonfly
+
 package syscall
 
 const (

src/syscall/ztypes_freebsd_386.go

 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs types_freebsd.go
 
+// +build 386,freebsd
+
 package syscall
 
 const (

src/syscall/ztypes_freebsd_amd64.go

 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs types_freebsd.go
 
+// +build amd64,freebsd
+
 package syscall
 
 const (

src/syscall/ztypes_freebsd_arm.go

 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs -- -fsigned-char types_freebsd.go
 
+// +build arm,freebsd
+
 package syscall
 
 const (

src/syscall/ztypes_linux_386.go

 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs types_linux.go
 
+// +build 386,linux
+
 package syscall
 
 const (

src/syscall/ztypes_linux_amd64.go

 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs types_linux.go
 
+// +build amd64,linux
+
 package syscall
 
 const (

src/syscall/ztypes_linux_arm.go

 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs types_linux.go
 
+// +build arm,linux
+
 package syscall
 
 const (

src/syscall/ztypes_linux_arm64.go

 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs -- -fsigned-char types_linux.go
 
+// +build arm64,linux
+
 package syscall
 
 const (

src/syscall/ztypes_linux_ppc64.go

 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs types_linux.go
 
+// +build ppc64,linux
+
 package syscall
 
 const (

src/syscall/ztypes_linux_ppc64le.go

 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs types_linux.go
 
+// +build ppc64le,linux
+
 package syscall
 
 const (

src/syscall/ztypes_netbsd_386.go

 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs types_netbsd.go
 
+// +build 386,netbsd
+
 package syscall
 
 const (

src/syscall/ztypes_netbsd_amd64.go

 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs types_netbsd.go
 
+// +build amd64,netbsd
+
 package syscall
 
 const (

src/syscall/ztypes_netbsd_arm.go

 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs types_netbsd.go
 
+// +build arm,netbsd
+
 package syscall
 
 const (

src/syscall/ztypes_openbsd_386.go

 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs types_openbsd.go
 
+// +build 386,openbsd
+
 package syscall
 
 const (

src/syscall/ztypes_openbsd_amd64.go

 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs types_openbsd.go
 
+// +build amd64,openbsd
+
 package syscall
 
 const (

src/syscall/ztypes_openbsd_arm.go

 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs types_openbsd.go
 
+// +build arm,openbsd
+
 package syscall
 
 const (

src/syscall/ztypes_solaris_amd64.go

 // Created by cgo -godefs - DO NOT EDIT
 // cgo -godefs types_solaris.go
 
+// +build amd64,solaris
+
 package syscall
 
 const (