* dispextern.h (struct face): New field - `copy', to help us with

* dispextern.h (struct face): New field - `copy', to help us with
	resource allocation.
	* xfaces.c (free_frame_faces): Do free the first two faces; don't
	free anything from a face that's a copy.
	(intern_frame_face): Mark every face we intern as a copy; its
	resources are actually a combination of the real faces.
	(Fset_face_attribute_internal): No need to check if we're trying
	to free one of the frame's GC's; they never enter into the
	picture.