mpd 0.19.6

This is a bugfix release:
* input
  - nfs: fix crash on connection failure
* archive
  - zzip: fix crash after seeking
* decoder
  - dsdiff, dsf, opus: fix deadlock while seeking
  - mp4v2: remove because of incompatible license

Closes #34812.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
mpd: update 0.19.6 bottle.