Update FAM support so it works fine on systems with and without
	libfam installed. So if you build Nautilus with FAM, then you can
	run it on a system with or without FAM.

	* configure.in:
	* libnautilus-extensions/Makefile.am:
	Remove the FAM_LIBS part.

	* libnautilus-extensions/nautilus-monitor.c: (get_fam_connection):
	Load the module before the FAMOpen2 call, and get all the function
	pointers.
	(get_event_uri), (process_fam_notifications),
	(nautilus_monitor_file), (nautilus_monitor_directory),
	(nautilus_monitor_cancel): Use the new CALL_FAM macro so we can
	use the function pointers when we call FAM.