File _servicedata of Package ipxe

<servicedata>
  <service name="tar_scm">
    <param name="url">https://github.com/ipxe/ipxe.git</param>
    <param name="changesrevision">61b4585e2aa273cd75a4da4369f2bc9e3095290d</param>
  </service>
</servicedata>