Log Message:
Remove libmpcdec/buildlink3.mk. Bump PKGREVISION.

This library is dead upstream and shouldn't be used for new stuff.
It hasn't been updated to support the newer musepack library (audio/musepack)
and thus depended on the old libmpcdec package instead.
This causes conflicts if you want to install e.g. KDE and vlc.

Requested by Sverre Froyen, ok markd@