* Makefile.in (SYSTEM_H): Define.
	Depend on $(SYSTEM_H), not system.h.

	* objc/Make-lang.in: Depend on $(SYSTEM_H), not system.h.

cp:
	* Make-lang.in: Depend on $(SYSTEM_H), not system.h.

f:
	* Make-lang.in: Depend on $(SYSTEM_H), not system.h.

java:
	* Make-lang.in: Depend on $(SYSTEM_H), not system.h.

From-SVN: r40883