* hash.c, init.c, libobjc.def, libobjc_entry.c, linking.m,
	makefile.dos, misc.c, nil_method.c, objects.c, sarray.c,
	selector.c, sendmsg.c, thr-dce.c, thr-decosf1.c, thr-irix.c,
	thr-mach.c, thr-objc.c, thr-os2.c, thr-posix.c, thr-pthreads.c,
	thr-rtems.c, thr-single.c, thr-solaris.c, thr-vxworks.c,
	thr-win32.c, thr.c: Replace "GNU CC" with "GCC".

From-SVN: r67134