fixup: mu4e: some cleanups / bytecomp warning fixes

mu4e/mu4e-view.el

@@ -37,6 +37,7 @@
 (require 'mu4e-message)
 
 (eval-when-compile (require 'gnus-art))
+
 (require 'comint)
 (require 'browse-url)
 (require 'button)
@@ -1816,33 +1817,6 @@ other windows."
           (setq mu4e~headers-view-win nil)
           (when (buffer-live-p (mu4e-get-headers-buffer))
             (switch-to-buffer (mu4e-get-headers-buffer))))))))
-
-;;
-;; Loading messages
-;;
-
-(defvar mu4e-loading-mode-map nil  "Keymap for *mu4e-loading* buffers.")
-(unless mu4e-loading-mode-map
-  (setq mu4e-loading-mode-map
-        (let ((map (make-sparse-keymap)))
-          (define-key map "n" 'ignore)
-          (define-key map "p" 'ignore)
-          (define-key map "q"
-            (lambda()(interactive)
-              (if (eq mu4e-split-view 'single-window)
-                  'kill-buffer
-                'kill-buffer-and-window)))
-          map)))
-(fset 'mu4e-loading-mode-map mu4e-loading-mode-map)
-
-(define-derived-mode mu4e-loading-mode special-mode
-  "mu4e:loading"
-  (use-local-map mu4e-loading-mode-map)
-  (let ((inhibit-read-only t))
-    (erase-buffer)
-    (insert (propertize "Loading message..."
-                        'face 'mu4e-system-face 'intangible t))))
-
 ;;;
 (provide 'mu4e-view)
 ;;; mu4e-view.el ends here