File _service of Package protobuf-opt

<services>
  <service name="tar_scm">
    <param name="url">https://github.com/protocolbuffers/protobuf.git</param>
    <param name="scm">git</param>
    <param name="exclude">.git</param>
    <param name="revision">v29.3</param>
    <param name="filename">protobuf-opt</param>
    <param name="versionprefix">29.3.0</param>
  </service>
  <service name="set_version"/>
  <service name="recompress">
    <param name="file">*.tar</param>
    <param name="compression">gz</param>
  </service>
</services>