Prune 47 obsolete ports

FreeBSD Ports maintainers have already deleted the following:
  audio/libmusicbrainz4
  biology/libgenome
  cad/kicad-library
  deskutils/narval
  devel/otrs
  devel/prototype
  devel/showgrammar
  games/yamsweeper
  graphics/gozer
  lang/logo
  lang/sxm
  lang/treecc
  mail/mailcrypt
  misc/pdfmap
  misc/salias
  misc/wmfirew
  multimedia/gopchop
  multimedia/xfce4-xmms-plugin
  multimedia/xmms-weasel
  net-mgmt/echolot
  net-p2p/py-fngrab
  net/googolplex
  net/p5-POE-Component-Spread
  net/p5-Spread-Message
  net/p5-Spread-Session
  net/py-spreadmodule
  net/wackamole
  ports-mgmt/pkgsearch
  print/latex2slides
  print/wprint
  science/euler
  science/flounder
  science/gdis
  science/hdf5-18
  science/netcdf-ftn
  science/netcdf3-ftn
  science/netcdf4
  security/labrea
  security/nbaudit
  security/saint
  sysutils/cpupowerd
  textproc/pybook
  textproc/roap
  www/mod_python3
  x11-fonts/texcm-ttf
  x11-wm/afterstep-i18n
  x11-wm/e16utils