Prune 8 obsolete ports

FreeBSD Ports maintainers have already deleted the following:
  databases/embedded_innodb
  devel/kdevelop-custom-buildsystem
  games/nethack34-qt
  net/avahi-qt3
  net/urtwn-firmware-kmod
  security/openvpn20
  security/py-crack
  security/pyobfsproxy
Success: multimedia/py-guessit v0.6
Success: www/py-tornado v3.1
Success: devel/hs-darcs v2.8.4_2