* go-backend.c: Include "output.h".
	(go_write_export_data): New function.
	* go-c.h (go_write_export_data): Declare.
	* Make-lang.in (go/go-backend.o): Depend on output.h.
	(go/export.o): Depend on $(GO_C_H).  Do not depend on
	$(MACHMODE_H), output.h, or $(TARGET_H).

From-SVN: r174366