Update libmpdclient to 2.14, mpd-20 to 0.20.17, and mpd-git to latest.
ver 0.20.17 (2018/02/11)
- output
- alsa: fix crash bug with 8 channels
- mixer
- alsa: fix rounding error at volume 0
- fix real-time and idle scheduling with Musl
- Android
- fix compatibility with Android 4.0