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".


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@67134 138bc75d-0d04-0410-961f-82ee72b054a4