Co-authored-by: Federico Beffa <beffa@fbengineering.ch>.
* emacs/guix-emacs.el (guix-emacs-find-autoloads-in-directory,
guix-emacs-subdirs): New functions.
(guix-emacs-find-autoloads): Search for autoloads in "guix.d"
subdirectories.
(guix-emacs-load-autoloads): Add subdirectories to 'load-path'.
* emacs/guix-init.el.in: Do not add guix emacs directory to 'load-path'
because it will be done by 'guix-emacs-load-autoloads'. Move
requiring 'guix-emacs' from the top-level to a clause for checking for
'guix-package-enable-at-startup'.
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