2005-07-21  Tor Lillqvist  <tml@novell.com>

	* gtk/gtksocket.c
	* gtk/gtkplug.c: Splice out backend-dependend parts to separate
	files, see below.

	* gtk/gtksocketprivate.h
	* gtk/gtkplugprivate.h: New files. Declare the backend-specific
	functions, and the private backend-independent functions they call
	back to.