File _link of Package python3-graphviz

<link project="SUSE:SLE-15-SP4:GA" package="python-graphviz" baserev="db328a4b5a5c4efeb9e968a3c1323a77">
  <patches>
    <delete name="python-graphviz.changes"/>
    <delete name="python-graphviz.spec"/>
  </patches>
</link>