File _servicedata of Package libbacktrace

<servicedata>
  <service name="tar_scm">
    <param name="url">https://github.com/ianlancetaylor/libbacktrace.git</param>
    <param name="changesrevision">d0f5e95a87a4d3e0a1ed6c069b5dae7cbab3ed2a</param>
  </service>
</servicedata>