* gcc.dg/weak/typeof-2.c: Needs aliases as well as weak.
	* gcc.dg/weak/weak-3.c: Likewise.
	* gcc.dg/weak/weak-5.c: Likewise.
	* gcc.dg/weak/weak-9.c: Likewise.
	* lib/file-format.exp (gcc_target_object_format): Darwin has Mach-O.
	* lib/target-supports.exp (check_weak_available): Mach-O does weak.

From-SVN: r89723