PR go/48411
	* Make-lang.in (gccgo-cross$(exeext)): New target.
	(go.all.cross): Depend on gccgo-cross$(exeext) instead of
	gccgo$(exeext).
	(go.install-common): Only install GCCGO_TARGET_INSTALL_NAME if
	gccgo-cross$(exeext) does not exist.

From-SVN: r184221