We already assume that if a source is buildable and should end up in OBJECTS we
can let Xcode build it, so we skip this input for the extra compiler.
Change-Id: I17b2408925b8e6513f0fa0d2459ec539bf7381d3
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@digia.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>