POSIX (.12?, I can't keep track any more--the draft the specifies
sockets) has chosen the name `local domain' for the Unix socket
domain, AF_LOCAL et al.  I suggest NetBSD use this name and keep
AF_UNIX as an alias for compatibility.  (Of course, noone has
suggested renaming `struct sockaddr_un' to sockaddr_lo or anything
else annoying like that which would actually require code changes.)