Prune 23 obsolete ports

FreeBSD Ports maintainers have already deleted the following:
  audio/gsi
  cad/mars
  dns/bind96
  french/ispell
  german/ispell
  german/ispell-alt
  german/ispell-neu
  graphics/glfw-devel
  hungarian/ispell
  multimedia/kino
  multimedia/vdr-plugin-softdevice
  polish/gimp-help
  polish/ispell
  portuguese/ispell-pt_BR
  russian/rus-ispell
  sysutils/mbmon
  textproc/british-ispell
  textproc/es-ispell
  textproc/ispell
  textproc/it-ispell
  textproc/nl-ispell
  textproc/sk-ispell
  ukrainian/ispell
Success: ports-mgmt/pkg v1.2.6
Success: devel/ccache v3.1.9_4