net/miniupnpd: Update to 2.1.20200510
From Tor Halvard Furulund:
- Update to latest upstream.
- Remove the extra patches as they are incorporated upstream
From Emanuel Haupt:
- Port cleanups
PR: 246925
Reported by: Tor Halvard Furulund <squat@squat.no>
Approved by: maintainer timeout, maintainer (previous version)