Prune 17 obsolete ports

FreeBSD Ports maintainers have already deleted the following:
  devel/gconfmm
  devel/libglademm
  devel/lua50-app
  devel/lua50-compat51
  devel/lua50-filename
  devel/lua50-gettext
  devel/lua50-posix
  devel/lua50-pty
  graphics/libgnomecanvasmm
  lang/lua50
  lang/tolua++50
  lang/tolua50
  multimedia/tovid
  net/lua50-luasocket
  security/squidclamav
  x11-toolkits/libgnomeuimm
  x11/libgnomemm