File _service of Package avr-libc

<services>
  <service name="tar_scm">
    <param name="scm">git</param>
    <param name="url">https://github.com/avrdudes/avr-libc.git</param>
    <param name="revision">main</param>
    <param name="filename">avr-libc</param>
    <param name="versionprefix">2.1.0</param>
  </service>
  <service name="recompress">
    <param name="file">*tar</param>
    <param name="compression">xz</param>
  </service>
<service name="set_version"/>
</services>