Adding missing SetMenuNoVoteButton native declaration (bug 4522, r=asherkin).

plugins/include/menus.inc

@@ -404,6 +404,16 @@ native bool:GetMenuExitBackButton(Handle:menu);
  */
 native SetMenuExitBackButton(Handle:menu, bool:button);
 
+/**
+ * Sets whether or not the menu has a "no vote" button in slot 1.
+ * By default, menus do not have a no vote button.
+ *
+ * @param menu				Menu Handle.
+ * @param button			True to enable the button, false to remove it.
+ * @return 					True if allowed; false on failure.
+ * @error					Invalid Handle.
+ */
+native bool:SetMenuNoVoteButton(Handle:menu, bool:button);
 
 /**
  * Cancels a menu from displaying on all clients.  While the