mpd 0.19.5

Bugfix release, fixing several crashes and deadlocks in plugins:
* 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
mpd: update 0.19.5 bottle.