Prune 30 obsolete ports

FreeBSD Ports maintainers have already deleted the following:
  astro/boinc-setiathome-enhanced
  devel/ruby-sdl
  devel/rubygem-linecache
  devel/rubygem-rascut
  devel/rubygem-ruby-debug
  devel/rubygem-ruby-debug-base
  devel/rubygem-ruby-debug-ide
  devel/rubygem-yajl-ruby077
  graphics/ruby-opengl
  japanese/gorua
  korean/php_doc
  lang/lua4
  lang/ruby18
  lang/tolua4
  multimedia/ffmpeg-devel
  multimedia/ffmpeg1
  net-im/amsn
  net-im/jabber-pymsn
  net-im/msn-proxy
  net-im/p5-Net-MSN
  net-im/p5-POE-Component-Client-MSN
  net-im/pidgin-msn-pecan
  net-im/py-msnp
  net-im/pymsn
  net-im/tmsnc
  net/p5-SOAP-Lite-060
  www/rubygem-mongrel
  www/rubygem-mongrel_cluster
  www/rubygem-rails-app-installer
  x11-toolkits/ruby-gtk