Mark some user options that can get evalled as risky.

* lisp/allout.el (allout-title):
* lisp/emacs-lisp/edebug.el (edebug-global-break-condition):
* lisp/gnus/message.el (message-mailer-swallows-blank-line):
* lisp/progmodes/gud.el (gud-tooltip-display):
* lisp/vc/ediff-mult.el (ediff-default-filtering-regexp):
Mark as risky.

lisp/emacs-lisp/edebug.el

@@ -225,6 +225,7 @@ After execution is resumed, the error is signaled again."
   "If non-nil, an expression to test for at every stop point.
 If the result is non-nil, then break.  Errors are ignored."
   :type 'sexp
+  :risky t
   :group 'edebug)
 
 (defcustom edebug-sit-for-seconds 1