File _service of Package go

<services>
  <service name="download_files"/>

  <service name="tar_scm">
    <param name="scm">git</param>
    <param name="url">https://llvm.org/git/compiler-rt.git</param>
    <param name="version">latest</param>
  </service>

  <service name="recompress">
    <param name="compression">bz2</param>
    <param name="file">*.tar</param>
  </service>

</services>