Remove CTM from 13-CURRENT after the release of FreeBSD-12.0.
The removal (and creation of a port) has been pre-announced in UPDATING
1 month ago. Packages are available for all supported FreeBSD vesions.
I did not think that another entry in UPDATING is required to note the
No MFC is planned - CTM shall be kept in base for all releases up to 12.x.
Reviewed by: rgrimes
Approved by: imp, bcr (manpages)
Differential Revision: https://reviews.freebsd.org/D17935