Revert "core/packs/pack-lang-*: Switch from paredit to smartparens"

This reverts commit a30412a02e0ec377cbb04aa8fcaa3467666f1569.
Support non-debian emacsen too

Only use debian-emacs-flavor when it is bound. Otherwise assume it is
false.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>