gnu-api-2-class.mm: Skip for Darwin < 9.

gnu-api-2-class.mm: Skip for Darwin < 9.

gcc/testsuite:

	* obj-c++.dg/gnu-api-2-class.mm: Skip for Darwin < 9.
	* obj-c++.dg/gnu-api-2-ivar.mm: Likewise.
	* obj-c++.dg/gnu-api-2-method.mm: Likewise.
	* obj-c++.dg/gnu-api-2-objc.mm: Likewise.
	* obj-c++.dg/gnu-api-2-object.mm: Likewise.
	* obj-c++.dg/gnu-api-2-property.mm: Likewise.
	* obj-c++.dg/gnu-api-2-protocol.mm: Likewise.
	* obj-c++.dg/gnu-api-2-sel.mm: Likewise.
	* objc.dg/gnu-api-2-class.m: Likewise.
	* objc.dg/gnu-api-2-ivar.m: Likewise.
	* objc.dg/gnu-api-2-method.m: Likewise.
	* objc.dg/gnu-api-2-objc.m: Likewise.
	* objc.dg/gnu-api-2-object.m: Likewise.
	* objc.dg/gnu-api-2-property.m: Likewise.
	* objc.dg/gnu-api-2-protocol.m: Likewise.
	* objc.dg/gnu-api-2-sel.m: Likewise.

From-SVN: r168617