[Patch][4.5] ObjC/C++ back-port of fix for PR35996

[IainS]

tested on i686-apple-darwin9, i686-pc-linux-gnu,
OK for 4.5?

Iain

gcc/objc/ChangeLog:

  	Backport from mainline:
	PR objc/35996
	* objc-act.c (objc_init): Warn that -fobjc-gc is ignored for
	-fgnu-runtime and set flag_objc_gc to zero.

gcc/testsuite/ChangeLog:

	Backport from mainline:
	2010-04-07  Iain Sandoe <iains@gcc.gnu.org>
	PR objc/35996
	* objc.dg/objc-gc-4.m: Run for all targets, prune new warning.
	* obj-c++.dg/objc-gc-3.mm: Ditto.
	2010-04-30  Iain Sandoe <iains@gcc.gnu.org>

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