Prune 20 obsolete ports

FreeBSD Ports maintainers have already deleted the following:
  audio/gnump3d
  audio/liteamp
  audio/rubygem-ogginfo
  comms/uhso-kmod
  deskutils/ecru
  deskutils/taskjuggler
  devel/czmq
  devel/py-distribute
  devel/rubygem-ruby-statsd
  devel/zmq
  editors/gphpedit
  finance/eqonomize-kde4
  irc/inspircd12
  lang/ruby-reference
  net-im/tapioca-qt
  net-im/telepathy-qt
  science/omnetpp
  textproc/libxml
  x11-fm/xnc
  x11-themes/lila-xfwm4