Add option to enable backends. Co-Authored-By: Oleksii Filonenko <brightone@protonmail.com>
Bemenu is a dynamic menu library and client program inspired by dmenu with support for wayland compositors (and also X11 and ncurses). Build and tested in NixOS 19.03.172392.6d7ed96429 in X11 (i3wm), wayland (sway) and ncurses (kitty).