gnu: Remove more packages deprecated for over almost a year.

* gnu/packages/games.scm (armagetron-advanced)
(cataclysm-dark-days-ahead, gnubackgammon, l-abbaye-des-morts)
(the-battle-for-wesnoth, the-battle-for-wesnoth-server)
(project-starfighter, kiki-the-nano-bot, fish-fillets-ng)
(dungeon-crawl-stone-soup): Let's forget this ever happened.
* gnu/packages/emacs-xyz.scm (geiser, paredit, git-modes/old-name)
(magit, magit-svn, haskell-mode, emacs-emms-player-mpv, bbdb)
(ert-runner, groovy-emacs-modes): Remove variable.
* gnu/packages/engineering.scm (emacs-emms-player-simple-mpv)
(emacs-evil-ediff, emacs-evil-mu4e, emacs-wgrep-helm, ao): Likewise.
* gnu/packages/finance.scm (monero-core): Likewise.
* gnu/packages/gnome.scm (dungeon-crawl-stone-soup-tiles)
(tales-of-maj-eyal, battle-tanks, the-legend-of-edgar)
(gnome-tweak-tool): Likewise.
* gnu/packages/gnuzilla.scm (conkeror): Likewise.
* gnu/packages/guile-xyz.scm (mcron2): Likewise.
* gnu/packages/image.scm (pngcrunch): Likewise.
* gnu/packages/linux.scm (eudev-with-hwdb): Likewise.
* gnu/packages/maths.scm (qtoctave): Likewise.
* gnu/packages/package-management.scm (guile2.0-guix): Likewise.
* gnu/packages/php.scm (php-with-bcmath): Likewise.
* gnu/packages/python-xyz.scm (python-kivy-next, python2-kivy-next):
Likewise.
* gnu/packages/video.scm (livestreamer): Likewise.
* gnu/packages/virtualization.scm (lookingglass): Likewise.
* gnu/packages/vulkan.scm (vulkan-icd-loader): Likewise.
* gnu/packages/syndication.scm (newsbeuter): Likewise.
(newsboat)[description]: Remove historical footnote.

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