bsd.h, [...]: GCC, not GNU CC.

	* config/vax/bsd.h, config/vax/elf.h, config/vax/netbsd-elf.h,
	config/vax/netbsd.h, config/vax/openbsd.h, config/vax/openbsd1.h,
	config/vax/ultrix.h, config/vax/vax-protos.h, config/vax/vax.c,
	config/vax/vax.h, config/vax/vax.md, config/vax/vaxv.h: GCC, not
	GNU CC.

From-SVN: r64294