File _link of Package python3-dulwich

<link project="SUSE:SLE-15-SP4:GA" package="python-dulwich" baserev="6533b3c6a63d8865dfcc923ba7f4b020">
  <patches>
    <delete name="python-dulwich.changes"/>
    <delete name="python-dulwich.spec"/>
  </patches>
</link>