Prune 8 obsolete ports

FreeBSD Ports maintainers have already deleted the following:
  databases/p5-DBD-mysql55
  databases/p5-DBD-mysql56
  devel/adabooch-doc-html
  irc/trickyirc
  lang/perl5.12
  textproc/p5-ElasticSearch
  x11-fonts/cosmic-sans-neue-mono
  x11-toolkits/sakura