[PATCH] Fix: Emacs 25 fancy diary inclusion in agenda

* lisp/org-agenda.el (org-get-entries-from-diary): Use the suitable
  display function.  Drop the usage of the obsolete diary-display-hook.

fancy-diary-display has been dropped in Emacs 25.  diary-fancy-display
is the long known replacement of fancy-diary-display.

diary-display-hook has been marked obsolete before Emacs 23.2.

lisp/org-agenda.el

@@ -5089,8 +5089,7 @@ of what a project is and how to check if it stuck, customize the variable
   "Get the (Emacs Calendar) diary entries for DATE."
   (require 'diary-lib)
   (let* ((diary-fancy-buffer "*temporary-fancy-diary-buffer*")
-	 (diary-display-hook '(fancy-diary-display))
-	 (diary-display-function 'fancy-diary-display)
+	 (diary-display-function 'diary-fancy-display)
 	 (pop-up-frames nil)
 	 (diary-list-entries-hook
 	  (cons 'org-diary-default-entry diary-list-entries-hook))