Prune 13 obsolete ports

FreeBSD Ports maintainers have already deleted the following:
  databases/php-sqlite3
  databases/postgresql83-client
  databases/postgresql83-contrib
  databases/postgresql83-docs
  databases/postgresql83-plperl
  databases/postgresql83-plpython
  databases/postgresql83-pltcl
  databases/postgresql83-server
  mail/claws-mail-cachesaver
  mail/claws-mail-gtkhtml2_viewer
  sysutils/userspace-rcu
  www/hs-yesod-default
  www/hs-yesod-json