Make `ring-bell-function' customizable.

* lisp/cus-start.el (all): Make `ring-bell-function' customizable.

lisp/ChangeLog

+2015-01-16  Daniel Colascione  <dancol@dancol.org>
+
+	* cus-start.el (all): Make `ring-bell-function' customizable.
+
 2015-01-16  Dmitry Gutov  <dgutov@yandex.ru>
 
 	* vc/vc-svn.el (vc-svn-dir-status-files): Pass t as

lisp/cus-start.el

@@ -421,6 +421,12 @@ Leaving \"Default\" unchecked is equivalent with specifying a default of
 						    "21.1")
              ;; term.c
              (visible-cursor cursor boolean "22.1")
+             ;; terminal.c
+             (ring-bell-function display
+              (choice
+               (const :tag "Default" nil)
+               (const :tag "Silent" ignore)
+               function))
 	     ;; undo.c
 	     (undo-limit undo integer)
 	     (undo-strong-limit undo integer)