Fixes a regression introduced in 7741139080a6b00aa4f1846fe7668859e91bec58.
Reported by Ludovic Courtès <ludo@gnu.org>.
Not all emacs packages have "...-autoloads.el" files, so there is a
chance that "~/.guix-profile/share/emacs/site-lisp" will not be added to
'load-path', so add it unconditionally.
* emacs/guix-init.el: Add guix emacs directory to 'load-path'. Move
requiring 'guix-emacs' to the top-level.
* emacs/guix-guile.el (guix-guile-current-module): New function.
* emacs/guix-devel.el: New file.
* emacs.am (ELFILES): Add it.
* doc/emacs.texi (Emacs Development): New node.
(Emacs Interface): Add it.
* doc/contributing.texi (The Perfect Setup): Mention it.
* doc/guix.texi (Top): Add it.
* emacs/guix-init.el: Add 'guix-devel-activate-mode-maybe' to
'scheme-mode-hook'.
* emacs/guix-{init,profiles}.el.in: Rename to ...
* emacs/guix-{init,profiles}.el: ... these. New files.
Use 'guix-config'.
* emacs/guix-config.el.in: New file.
* emacs.am (nodist_lisp_DATA): Add it. Move them to ...
(ELFILES): ... here.
* .gitignore, configure.ac: Adjust accordingly.
