dns/opendnssec2: Update to 2.1.7
Patches removed were incorporated upstream.
Changelog: https://www.opendnssec.org/2020/10/opendnssec-2-1-7/
PR: 250293
Submitted by: Jaap Akkerhuis <jaap@NLnetLabs.nl> (maintainer)
MFH: 2020Q4 (blanket: bugfix release)