Log Message:
Update musicpd to 0.19.14:

ver 0.19.14 (2016/03/18)
* decoder
  - dsdiff: fix off-by-one buffer overflow
  - opus: limit tag size to 64 kB
* archive
  - iso9660: fix buffer overflow
* fix quadratic runtime bug in the tag pool
* fix build failures on non-glibc builds due to constexpr Mutex