message: fixed compile error on FreeBSD.
diff: @@ -1213,7 +1213,7 @@ PHP_FUNCTION(swoole_get_local_ip)
  PHP_FUNCTION(swoole_get_local_mac)
  {
  -#ifndef __MACH__
  +#ifdef SIOCGIFHWADDR
  struct ifconf ifc;
  struct ifreq buf[16];
  char mac[32] = {0};
  @@ -1249,10 +1249,10 @@ PHP_FUNCTION(swoole_get_local_mac)
  i++;
  }
  }
  -
  close(sock);
  #else
  -
  + php_error_docref(NULL TSRMLS_CC, E_WARNING, "swoole_get_local_mac is not supported.");
  + RETURN_FALSE;
  #endif
  }
  