* dbus/dbus-connection.c
	(_dbus_connection_queue_received_message_link): new function that
	can't fail due to OOM

	* dbus/dbus-message.c (_dbus_message_loader_pop_message_link):
	new function pops a message together with a list link
	containing it.

	* dbus/dbus-transport-unix.c (queue_messages): use new link-based
	message queuing functions to avoid needing to alloc memory