File _service of Package ocaml-ppx_derivers

<services>
  <service name="tar_scm" mode="disabled">
    <param name="url">https://github.com/ocaml-ppx/ppx_derivers.git</param>
    <param name="scm">git</param>
    <param name="versionformat">1.2.1</param>
    <param name="revision">1.2.1</param>
    <param name="filename">ocaml-ppx_derivers</param>
  </service>
  <service name="recompress" mode="disabled">
    <param name="file">*.tar</param>
    <param name="compression">xz</param>
  </service>
  <service name="set_version" mode="disabled"/>
</services>