Make.pkg: Always define _CGO_CFLAGS and friends.

Submitting TBR to fix Darwin build.

TBR=rsc
CC=golang-dev
https://golang.org/cl/4273096

src/Make.pkg

@@ -117,16 +117,6 @@ dir:
 #	_obj/x.cgo2.c	- C implementations compiled with gcc to create a dynamic library
 #
 
-ifneq ($(CGOFILES)$(SWIGFILES),)
-# Have to run gcc with the right size argument on hybrid 32/64 machines.
-_CGO_CFLAGS_386=-m32
-_CGO_CFLAGS_amd64=-m64
-_CGO_LDFLAGS_freebsd=-shared -lpthread -lm
-_CGO_LDFLAGS_linux=-shared -lpthread -lm
-_CGO_LDFLAGS_darwin=-dynamiclib -Wl,-undefined,dynamic_lookup
-_CGO_LDFLAGS_windows=-shared -lm -mthreads
-endif
-
 ifdef CGOFILES
 _obj/_cgo_run: $(CGOFILES)
 	@mkdir -p _obj
@@ -176,6 +166,14 @@ _obj/_cgo_import.c: _cgo1_.o
 # added _cgo_defun.$O to $OFILES, and added the installed copy of
 # package_x.so (built from x.cgo2.c) to $(INSTALLFILES).
 
+# Have to run gcc with the right size argument on hybrid 32/64 machines.
+_CGO_CFLAGS_386=-m32
+_CGO_CFLAGS_amd64=-m64
+_CGO_LDFLAGS_freebsd=-shared -lpthread -lm
+_CGO_LDFLAGS_linux=-shared -lpthread -lm
+_CGO_LDFLAGS_darwin=-dynamiclib -Wl,-undefined,dynamic_lookup
+_CGO_LDFLAGS_windows=-shared -lm -mthreads
+
 # Have to compile the runtime header.
 RUNTIME_CFLAGS=-I$(pkgdir)