MPD: Upgrade to 0.18.11, convert to procd, refresh patches

Signed-off-by: Ted Hess <thess@kitschensync.net>
shairport: remove unecessary dependencies

Signed-off-by: Ted Hess <thess@kitschensync.net>
minidlna: remove ffmpeg includes - not needed. Now builds with newer ffmpeg versions

Signed-off-by: Ted Hess <thess@kitschensync.net>