Log Message:
libmpdclient: Update to 2.19

libmpdclient 2.19 (2020/07/03)
* fix off-by-one bug in MPD_HOST parser
* add function mpd_lookup_replay_gain_mode()
* identify messages with length over the buffer limit
* support MPD protocol 0.16
 - replay gain
* support MPD protocol 0.19
 - idle events "neighbor" and "mount"
* support MPD protocol 0.20
 - rangeid
* support MPD protocol 0.21
  - command "tagtypes all"