pfPorts: Remove lzo2, directly use from FreeBSD ports

Our port was initially unmodified from FreeBSD ports, and then
only minimally diverged in terms of keeping up with upstream
libtool compatibility. It is required by the OpenVPN port.

Our local port was quite outdated (2.02 was from 2005) and the
plain FreeBSD port seems maintained, from now on, just let's use
theirs.