Add older_than function to complement newer_than function. Also make the userland instance reversed to be compatable with current baselayout, which truely does suck.

src/librc/rc.map

@@ -13,6 +13,7 @@ global:
 	rc_environ_fd;
 	rc_find_pids;
 	rc_newer_than;
+	rc_older_than;
 	rc_runlevel_exists;
 	rc_runlevel_get;
 	rc_runlevel_list;