File _service of Package mingw-w64-libffi

<services>
  <service name="download_url">
    <param name="url">https://github.com/libffi/libffi/releases/download/v3.4.4/libffi-3.4.4.tar.gz</param>
    <param name="filename">libffi-3.4.4.tar.gz</param>
  </service>
</services>