Add multiple results and timeout handling to the Mac OS mDNS native extension

src/pkg/mdns/mdns_extension_linux.cc

 // Copyright (c) 2015, the Fletch project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE.md file.
 
 #if defined(FLETCH_TARGET_OS_LINUX)
 
 #include <assert.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include "include/dart_api.h"
 #include "include/dart_native_api.h"
 
 #include "mdns_extension.h"
 
 // Dummy implementation for Linux.
-void HandleLookup(Dart_Port port_id, char* adress) {}
+void HandleLookup(Dart_Port port_id, int type, char* fullname, int timeout) {}
 
 #endif