[HEADSUP] retire TIOCDCDTIMESTAMP

[M. Warner Losh]

In message: <23206.1087846355 at critter.freebsd.dk>
            Poul-Henning Kamp <phk at phk.freebsd.dk> writes:
: The RFC 2783 PPS-API has been standardized to do everything
: TIOCDCDTIMESTAMP did and quite a bit more.

I think this is reasonable on its face.  Unless this breaks a bunch of
ports I don't see a big problem with it.  I have some problems using
pps api at times, but those aren't relevant for this change...

Warner