mpd: update to 0.18.16

Signed-off-by: Ted Hess <thess@kitschensync.net>
apr-util: update to 1.5.4

Signed-off-by: Jiri Slachta <slachta@cesnet.cz>
Merge pull request #365 from jslachta/master

apr-util: update to 1.5.4