emacs: Move loading packages to "guix-emacs.el".

* emacs/guix-init.el: Move the code for auto-loading Emacs packages to...
  (guix-package-enable-at-startup): Move to...
* emacs/guix-emacs.el (guix-package-enable-at-startup): ... here.

emacs/guix-emacs.el

@@ -28,6 +28,14 @@
 (unless (require 'guix-profiles nil t)
   (defvar guix-user-profile (expand-file-name "~/.guix-profile")))
 
+(defcustom guix-package-enable-at-startup t
+  "If non-nil, activate Emacs packages installed in a user profile.
+Set this variable to nil before requiring `guix-emacs' file to
+avoid loading autoloads of Emacs packages installed in
+`guix-user-profile'."
+  :type 'boolean
+  :group 'guix)
+
 (defcustom guix-emacs-activate-after-operation t
   "Activate Emacs packages after installing.
 If nil, do not load autoloads of the Emacs packages after
@@ -117,6 +125,10 @@ See `guix-emacs-activate-after-operation' for details."
        ;; profile will not be loaded).
        (guix-emacs-load-autoloads guix-current-profile)))
 
+(when guix-package-enable-at-startup
+  (add-to-list 'load-path (guix-emacs-directory))
+  (guix-emacs-load-autoloads))
+
 (provide 'guix-emacs)
 
 ;;; guix-emacs.el ends here

emacs/guix-init.el

@@ -1,19 +1,6 @@
 (require 'guix-autoloads)
 (require 'guix-emacs)
 
-(defcustom guix-package-enable-at-startup t
-  "If non-nil, activate Emacs packages installed in a user profile.
-Set this variable to nil before requiring `guix-init' file to
-avoid loading autoloads of Emacs packages installed in
-`guix-user-profile'."
-  :type 'boolean
-  :group 'guix)
-
-(add-to-list 'load-path (guix-emacs-directory))
-
-(when guix-package-enable-at-startup
-  (guix-emacs-load-autoloads))
-
 (add-hook 'scheme-mode-hook 'guix-devel-activate-mode-maybe)
 (add-hook 'shell-mode-hook 'guix-build-log-minor-mode-activate-maybe)