Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/
They were already converted to use libulog, so it's easy to convert them to utmpx.
Also add some missing $FreeBSD$ to keep svn happy.
Because our implementation guarantees the strings inside struct utmpx to be null terminated, we don't need to copy everything out, which makes the code nicer to read. Also set WARNS to 6 and add $FreeBSD$ to keep SVN happy.