File _service of Package clanlib

<services>
  <service name="download_url">
    <param name="host">codeload.github.com</param>
    <param name="protocol">https</param>
    <param name="path">/sphair/ClanLib/tar.gz/v4.0.0</param>
    <param name="filename">ClanLib-4.0.0.tgz</param>
  </service>
</services>