net/netatalk3: Update to 3.2.0

See https://github.com/Netatalk/netatalk/releases/tag/netatalk-3-2-0 for
the list of changes in this release.

A big change was a move to Meson for build. This introduced some new
breakages, but I think I have fixed them. Runtime tests show
functionality is on par with 3.1.