Remove $FreeBSD$: one-line nroff pattern

Remove /^\.\\"\s*\$FreeBSD\$$\n/

Drop 'Set to' from most src.conf(5) knobs

The description is clearly what effect the knob has when set, so the
additional text was unnecessary.

Reviewed by: jhb, se
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D29583

Formalize LEAPSECONDS and OLDTIMEZONES in share/zoneinfo/... as
`MK_ZONEINFO_LEAPSECONDS_SUPPORT == yes` and
`MK_ZONEINFO_OLD_TIMEZONES_SUPPORT == yes`.

Keep `LEAPSECONDS` and `OLDTIMEZONES` for backwards compatibility,
but print out a warning notifying users that they should use the new
variables, in an effort to migrate them to the variables. This is being
done mostly for automated build tools, etc, that might rely on these
variables being set. The variables will be removed in the future on
^/head, e.g., after ^/stable/12 is cut.

MFC after: 1 month
Relnotes: yes
Reviewed by: bdrewery
Differential Revision: D11376