* configure.ac: Substitute GOC_FOR_TARGET and GCC_FOR_TARGET.
	* Makefile.am (MOSTLYCLEANFILES): Add check-gcc.
	(check-gccgo): Create via a temporary file.
	(check-gcc): New target.
	(CHECK_ENV): Set CC.
	(ECHO_ENV): Report CC.
	(check-go-tool): Depend on check-gcc.
	(check-runtime, check-cgo-test, check-carchive-test): Likewise.
	* configure, Makefile.in: Rebuild.

From-SVN: r251540