[gcc-in-cxx] Fix objc frontend to build with C++

[Ian Lance Taylor]

I committed this patch to the gcc-in-cxx branch to let the objc frontend
to let it build with C++.  Among other things, this corrects an earlier
merge error.

Ian


2009-03-04  Ian Lance Taylor  <iant@google.com>

	* objc/Make-lang.in (cc1obj-dummy$(exeext)): Link with $(CXX).
	(cc1obj$(exeext)): Likewise.
	* objc/objc-act.c (objc_rewrite_function_call): Change params to
	tree.
	(objc_gimplify_expr): Change return type to int.
	* objc/objc-act.h (objc_gimplify_expr): Update declaration.


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