Prepare move of ctm from base to a port (misc/ctm) by:

- Adding a note to UPDATING
- Adding a note to the history section of the manpage ctm.1
- Adding a message printed to STDERR to the ctm program

This version is meant for release in FreeBSD-12.0 and should remain in
FreeBSD-12 over its life-time.

A follow-up commit will remove ctm from -CURRENT after the MFC to 12
has happened.

Approved by:	imp, rgrimes, bcr (man-page)
MFC after:	3 days
Relnotes:	yes
Differential Revision:	https://reviews.freebsd.org/D17969

UPDATING

@@ -31,6 +31,12 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 13.x IS SLOW:
 	disable the most expensive debugging functionality run
 	"ln -s 'abort:false,junk:false' /etc/malloc.conf".)
 
+20181115:
+	The set of CTM commands (ctm, ctm_smail, ctm_rmail, ctm_dequeue)
+	has been converted to a port (misc/ctm) and will be removed from
+	FreeBSD-13.  It is available as a package (ctm) for all supported
+	FreeBSD versions.
+
 20181110:
 	The default newsyslog.conf(5) file has been changed to only include
 	files in /etc/newsyslog.conf.d/ and /usr/local/etc/newsyslog.conf.d/ if

usr.sbin/ctm/ctm/ctm.1

@@ -12,7 +12,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd April 14, 2016
+.Dd November 15, 2018
 .Dt CTM 1
 .Os
 .Sh NAME
@@ -321,6 +321,12 @@ The
 .Nm
 command appeared in
 .Fx 2.1 .
+.Pp
+The latest
+.Nm
+code has been made available as a port (misc/ctm) in preparation of removal
+from base in
+.Fx 13.0 .
 .Sh AUTHORS
 .An -nosplit
 The CTM system has been designed and implemented by

usr.sbin/ctm/ctm/ctm.c

@@ -144,6 +144,9 @@ main(int argc, char **argv)
 	warnx("%d errors during option processing",stat);
 	return Exit_Pilot;
     }
+    fprintf(stderr, "CTM will be removed from FreeBSD-13, and will be "
+	"provided as a port (misc/ctm) or package (ctm).\n\n");
+
     stat = Exit_Done;
     argc -= optind;
     argv += optind;