Remove support for FreeBSD < 12.3 from the Tree.
* Mk/bsd.port.mk: bump minimal FreeBSD version to 12.3
* Mk/bsd.port.mk: update an example
* sysutils/lsof: drop support for ancient FreeBSD releases.
* multimedia/ustreamer: remove inline patch for 12.2
* x11/wayland-logout: remove support for FreeBSD < 12.3
* sysutils/bhyve+: remove support for FreeBSD 12.2
* databases/clickhouse: remove support for FreeBSD 12.2
* databases/mariadb106-server: remove support for FreeBSD 12.2
* devel/cvsd: no need to test for FreeBSD >=5 anymore
* devel/imake: no need to support a.out anymore
* japanese/kterm: no need to support FreeBSD <= 9
* math/igraph: remove support for FreeBSD 12.2
* net/onedrive: remove support for FreeBSD 12.2
* security/botan110: remove support for FreeBSD 12.[012]. This change should be overruled by the expiration date of the port itself.
* security/ipsec-tools: no need to test for FreeBSD >= 11