add common_compatible_license() function

darcs-hash:20081203032705-5ed1f-c425d8aef897b4223db3f2cb0250ed6fbe816f67.gz

lib/util.php

@@ -2081,3 +2081,8 @@ function common_memcache() {
 		return $cache;
 	}
 }
+
+function common_compatible_license($from, $to) {
+	# XXX: better compatibility check needed here!
+	return ($from == $to);
+}