Log Message:
Update to 2.5.1, from PR 38499.  May also solve PR 38712.

6 years passed since 2.0.4, too much changes happened to list here.
Most of them seem to fix various playback accuracy issues.
Many patches were merged upstream.  Major change -- X11 frontend (xxmp)
is missing, there's nothing in change log about that.

pkgsrc change: pulseaudio support (default on).

OK by wiz@.