message: add support for miniupnpc api version 14
  The value of new arg ttl is set to 2 as it's recommended default.
diff: @@ -1083,10 +1083,14 @@ void ThreadMapPort()
  #ifndef UPNPDISCOVER_SUCCESS
  /* miniupnpc 1.5 */
  devlist = upnpDiscover(2000, multicastif, minissdpdpath, 0);
  -#else
  +#elif MINIUPNPC_API_VERSION < 14
  /* miniupnpc 1.6 */
  int error = 0;
  devlist = upnpDiscover(2000, multicastif, minissdpdpath, 0, 0, &error);
  +#else
  + /* miniupnpc 1.9.20150730 */
  + int error = 0;
  + devlist = upnpDiscover(2000, multicastif, minissdpdpath, 0, 0, 2, &error);
  #endif
  struct UPNPUrls urls;
  