Prune 9 obsolete ports

FreeBSD Ports maintainers have already deleted the following:
  archivers/xz
  devel/lua-filename
  games/deng
  lang/python26
  misc/sword17
  net-mgmt/nagios-devel
  textproc/redland-bindings-python
  www/mod_authnz_external
  www/suphp