Update to tnftpd 20081009.  Notable changes since 20061217:

* Don't split large commands into multiple commands; just fail on them.
  This prevents cross-site request forgery (CSRF)-like attacks,
  when a web browser is used to access an ftp server.
* Enhance -C to support an optional @host ('-C user[@host]'):
  checks whether user as connecting from host would be granted
  access by ftpusers(5).
* Support IPv6 in the host directive of ftpusers(5).
* Implement -n to disable hostname lookups.

* Disable SOCKS support; I don't have the ability to test it,
  and the autoconf checks were very out of date.
* Add configure --with-pam to enable PAM authentication support.
  Defaults to checking for PAM.
* Add configure --with-skey to enable S/Key authentication support.
  Incompatible with --with-pam, defaults to no.
* Fix pathnames in the installed manual pages to contain
  the appropriate $(prefix) substitution.
* Use fcntl(3) locking instead of flock(3) or lockf(3).
* Various other portability improvements.

(lukem)