Allow SIGINT to kill mainmenu again

src/guiEngine.h

@@ -109,7 +109,8 @@ class GUIEngine {
 				gui::IGUIElement* parent,
 				IMenuManager *menumgr,
 				scene::ISceneManager* smgr,
-				MainMenuData* data);
+				MainMenuData* data,
+				bool& kill);
 
 	/** default destructor */
 	virtual ~GUIEngine();
@@ -159,6 +160,9 @@ class GUIEngine {
 	/** the formspec menu */
 	GUIFormSpecMenu*		m_menu;
 
+	/** reference to kill variable managed by SIGINT handler */
+	bool&					m_kill;
+
 	/** variable used to abort menu and return back to main game handling */
 	bool					m_startgame;