Remove expired ports:
2020-10-09 sysutils/syslog-ng322: Agreed upon upstream one year deprecation policy
2020-10-09 sysutils/syslog-ng321: Agreed upon upstream one year deprecation policy
2020-10-09 sysutils/syslog-ng320: Agreed upon upstream one year deprecation policy
2020-10-09 dns/opendnssec: EOLed by upstream
2020-10-09 sysutils/syslog-ng323: Agreed upon upstream one year deprecation policy