Log Message:
Updated musicpd to 0.20.5.

ver 0.20.5 (2017/02/20)
* tags
  - id3: fix memory leak on corrupt ID3 tags
* decoder
  - sidplay: don't require libsidutils when building with libsidplayfp
* output
  - httpd: fix two buffer overflows in IcyMetaData length calculation
* mixer
  - alsa: fix crash bug