File _link of Package dahdi-tools

<link project="network:telephony" package="dahdi-tools" baserev="306566bc1c0e60f30c0cf4495afa82b4">
  <patches>
    <delete name="dahdi-tools-3.1.0.tar.gz"/>
    <delete name="dahdi-tools-3.1.0.tar.gz.asc"/>
  </patches>
</link>