gnu: Adapt Emacs packages to use the new check phase.
* gnu/packages/emacs.scm (emacs-dash, emacs-s, emacs-string-inflection,
emacs-company, emacs-clojure-mode, emacs-julia-mode, emacs-elfeed,
emacs-memoize, emacs-use-package, emacs-xmlgen, emacs-json-reformat,
emacs-which-key, emacs-ws-butler, emacs-git-messenger, emacs-browse-at-remote,
emacs-evil-quickscope)[arguments]: Add #:tests? and #:test-command arguments
to use the new check phase.
(emacs-json-reformat)[inputs]: Move emacs-dash and emacs-shut-up to ...
[native-inputs]: here. Add ert-runner.
(emacs-company)[arguments]: Refactor fix-bin-dir phase.
Signed-off-by: Arun Isaac <arunisaac@systemreboot.net>