update mpd-git to latest and mpd-20 to 0.20.11
ver 0.20.11 (2017/10/18)
- storage
- curl: support Content-Type application/xml
- decoder
- ffmpeg: more reliable song duration
- gme: fix track numbering
- improve random song order when switching songs manually
- fix case insensitive search without libicu
- fix Unicode file names in playlists on Windows
- fix endless loop when accessing malformed file names in ZIP files