mpd 0.18.12

New release logs are as follows:
* database
  - proxy: fix build failure with libmpdclient 2.2
  - proxy: fix add/search and other commands with libmpdclient < 2.9
* decoder
  - audiofile: improve responsiveness
  - audiofile: fix WAV stream playback
  - dsdiff, dsf: fix stream playback
  - dsdiff: fix metadata parser bug (uninitialized variables)
  - faad: estimate song duration for remote files
  - sndfile: improve responsiveness

* randomize next song when enabling "random" mode while not playing
* randomize next song when adding to single-song queue
fluid-synth: add 1.1.6 bottle.
mpd: add 0.18.12 bottle.

Closes #31265.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
Updating pyqt to 4.11.1
Fix pyqt formula upgraded to 4.11.1

- the custom QMAKESPEC hacks for Mavericks seem to not be needed any longer

- creating the `pyconfig.py` file by running `python configure.py` in a
  different folder seems to work, but I am not sure if this is actually still
  needed, so for now I commented this out. I have sucessfully built and used
  PyQWT even without this generated `pyqtconfig.py`. It's use is deprecated
  anyway it seems. I don't know if not having it breaks other stuff, which is
  why I left the code in the formula for now, albeit commented out.
pyqt: add 4.11.1 bottle.