Merge from vendor branch TNF:

Merge from vendor branch TNF:

Add a moc-devel package for version 2.5.0alpha3.  This package uses
a getline() function taken from nbftp--bothering with gnulib was too
annoying.  It works for me on NetBSD-current, but please let me
know if there are any problems.

I've also extended the check for sched_get_priority_max(3)--both here
and in audio/moc--to look in librt prior to giving up.  This allows
moc to run with realtime priority on NetBSD-current; unfortunately,
presently this requires root perms.