Prune 10 obsolete ports

FreeBSD Ports maintainers have already deleted the following:
  audio/bonk
  audio/muine
  audio/xmms-bonk
  databases/py-simplecouchdb
  editors/nxml
  graphics/py-stl
  net/linphone-base
  security/pam_pgina
  sysutils/gtk-send-pr
  x11-themes/kde4-windeco-nitrogen