File _service of Package ffmpeg-7

<services>
  <service name="obs_scm" mode="serveronly">
    <param name="url">https://src.opensuse.org/jengelh/ffmpeg-7.git</param>
    <param name="scm">git</param>
    <param name="revision">master</param>
    <param name="extract">*</param>
  </service>
</services>