Remove Ruby 1.8.7-only ports

The following ports currently only build with Ruby 1.8.7, which is EOL'd
fully in June 2013.  Rather than wait for FreeBSD to remove these in 3
months, the default to Ruby has been switch to 1.9.3 on DragonFly and
any ports that don't build with the default Ruby are getting removed now.
They will come back if/when FreeBSD porters fix the ports to work with
Ruby 19, which should happen for a few cases.

  textproc/rast
  japanese/mobileimap
  security/ruby-acl
  devel/ruby-fam
  dns/opendnssec
  devel/ruby-mmap
  devel/ruby-slang
  textproc/ruby-xslt
  archivers/ruby-bz2
  games/ruby-exmars
  devel/ruby-rudl
  devel/ruby-sysvipc
  multimedia/ruby-flvtool2
  textproc/ruby-amrita
  textproc/ruby-libxml
  devel/ruby-rcov
  audio/ruby-xmms
  devel/rubygem-rparsec
  japanese/ruby-slang
  security/ruby-tcpwrap
  devel/rubygem-ripper
  net-im/rubygem-xmpp4r
  devel/rubygem-zoom
  devel/ruby-subversion
  devel/ruby-gettext
  lang/ruby-lua4
  graphics/ruby-opengl
  textproc/ruby-sablot
  textproc/ruby-xmlscan-old
  textproc/rubygem-ferret
  textproc/rubygem-formosa
  devel/rubygem-io-like
  misc/rubygem-ohcount
  databases/ruby-interbase
  textproc/rubygem-htmltools
  devel/rubygem-linecache
  devel/ruby-io-reactor
  audio/ruby-vorbisfile
  www/rubygem-mongrel
  devel/rubygem-parsetree
  net-im/rubygem-termtter
  graphics/rubygem-turing
  www/ruby-nora
  devel/ruby-jttui
  x11/ruby-gtktrayicon
  devel/rubygem-getopt-declare
  textproc/ruby-erbscan
  graphics/rubygem-objectdetect