Disable building tickadj(8) by removing util from SUBDIR in the xntpd
Makefile. Note that the sources are still there and tickadj can still
be built and installed by doing:
# cd /usr/src/usr.sbin/xntpd/util
# make all install
There are enough references to tickadj in e.g. the xntpd documentation
(not to mention the sysctl variables it uses etc.) that I don't feel
up to implementing the final solution right now.
Kinda-approved-by: phk