Log Message:
net/powerdns: Update to 4.2.2

Changes since 4.2.1:

* Released:
  - 9th of April 2020

* New Features:
  - api: add includerings option to statistics endpoint

* Improvements:
  - cache: strictly enforce maximum size, and improve cleanup routine

* Bug Fixes:
  - fix records ending up in wrong packet section

  - avoid IXFR-in corruption when deltas come in close together.
    Please see the IXFR-in corruption upgrade notes

  - fix out-of-bound access for zero length "serialized" string when
    using lmdbbackend.

  - bind backend: pthread_mutex_t should be inited and destroyed and not be copied

* Reference:
  - https://doc.powerdns.com/authoritative/changelog/4.2.html#change-4.2.2