* glib/dbus-gmain.c: (dbus_connection_prepare),
	(dbus_connection_check), (dbus_connection_dispatch), (add_watch),
	(remove_watch), (dbus_connection_hookup_with_g_main):
	Rewrite the glib handling to use its own GSource instead of a
	GIOChannel so we can catch messages put in the queue while waiting
	for a reply.