pkg/syscall: unexport Prlimit.

This syscall was inadvertently exported when fixing
Getrlimit/Setrlimit on 32-bit platforms.

R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/6458051

src/pkg/syscall/syscall_linux.go

@@ -839,7 +839,7 @@ func Mount(source string, target string, fstype string, flags uintptr, data stri
 //sys	Nanosleep(time *Timespec, leftover *Timespec) (err error)
 //sys	Pause() (err error)
 //sys	PivotRoot(newroot string, putold string) (err error) = SYS_PIVOT_ROOT
-//sysnb Prlimit(pid int, resource int, old *Rlimit, newlimit *Rlimit) (err error) = SYS_PRLIMIT64
+//sysnb prlimit(pid int, resource int, old *Rlimit, newlimit *Rlimit) (err error) = SYS_PRLIMIT64
 //sys	Read(fd int, p []byte) (n int, err error)
 //sys	Readlink(path string, buf []byte) (n int, err error)
 //sys	Rename(oldpath string, newpath string) (err error)

src/pkg/syscall/syscall_linux_386.go

@@ -78,7 +78,7 @@ const rlimInf32 = ^uint32(0)
 const rlimInf64 = ^uint64(0)
 
 func Getrlimit(resource int, rlim *Rlimit) (err error) {
-	err = Prlimit(0, resource, rlim, nil)
+	err = prlimit(0, resource, rlim, nil)
 	if err != ENOSYS {
 		return err
 	}
@@ -106,7 +106,7 @@ func Getrlimit(resource int, rlim *Rlimit) (err error) {
 //sysnb setrlimit(resource int, rlim *rlimit32) (err error) = SYS_SETRLIMIT
 
 func Setrlimit(resource int, rlim *Rlimit) (err error) {
-	err = Prlimit(0, resource, nil, rlim)
+	err = prlimit(0, resource, nil, rlim)
 	if err != ENOSYS {
 		return err
 	}

src/pkg/syscall/syscall_linux_arm.go

@@ -98,7 +98,7 @@ const rlimInf32 = ^uint32(0)
 const rlimInf64 = ^uint64(0)
 
 func Getrlimit(resource int, rlim *Rlimit) (err error) {
-	err = Prlimit(0, resource, rlim, nil)
+	err = prlimit(0, resource, rlim, nil)
 	if err != ENOSYS {
 		return err
 	}
@@ -126,7 +126,7 @@ func Getrlimit(resource int, rlim *Rlimit) (err error) {
 //sysnb setrlimit(resource int, rlim *rlimit32) (err error) = SYS_SETRLIMIT
 
 func Setrlimit(resource int, rlim *Rlimit) (err error) {
-	err = Prlimit(0, resource, nil, rlim)
+	err = prlimit(0, resource, nil, rlim)
 	if err != ENOSYS {
 		return err
 	}

src/pkg/syscall/zsyscall_linux_386.go

@@ -598,7 +598,7 @@ func PivotRoot(newroot string, putold string) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Prlimit(pid int, resource int, old *Rlimit, newlimit *Rlimit) (err error) {
+func prlimit(pid int, resource int, old *Rlimit, newlimit *Rlimit) (err error) {
 	_, _, e1 := RawSyscall6(SYS_PRLIMIT64, uintptr(pid), uintptr(resource), uintptr(unsafe.Pointer(old)), uintptr(unsafe.Pointer(newlimit)), 0, 0)
 	if e1 != 0 {
 		err = e1

src/pkg/syscall/zsyscall_linux_amd64.go

@@ -598,7 +598,7 @@ func PivotRoot(newroot string, putold string) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Prlimit(pid int, resource int, old *Rlimit, newlimit *Rlimit) (err error) {
+func prlimit(pid int, resource int, old *Rlimit, newlimit *Rlimit) (err error) {
 	_, _, e1 := RawSyscall6(SYS_PRLIMIT64, uintptr(pid), uintptr(resource), uintptr(unsafe.Pointer(old)), uintptr(unsafe.Pointer(newlimit)), 0, 0)
 	if e1 != 0 {
 		err = e1

src/pkg/syscall/zsyscall_linux_arm.go

@@ -598,7 +598,7 @@ func PivotRoot(newroot string, putold string) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Prlimit(pid int, resource int, old *Rlimit, newlimit *Rlimit) (err error) {
+func prlimit(pid int, resource int, old *Rlimit, newlimit *Rlimit) (err error) {
 	_, _, e1 := RawSyscall6(SYS_PRLIMIT64, uintptr(pid), uintptr(resource), uintptr(unsafe.Pointer(old)), uintptr(unsafe.Pointer(newlimit)), 0, 0)
 	if e1 != 0 {
 		err = e1