Correctly exit from game when Alt+F4 pressed or 'x' button clicked.

See for details:

https://savannah.nongnu.org/bugs/?13163

https://savannah.nongnu.org/bugs/?17839

http://www.openbsd.org/cgi-bin/cvsweb/ports/games/crack-attack/patches/patch-src_gtk-gui_gui_main_cxx

--- crack-attack-1.1.14/src/gtk-gui/gui_main.cxx	2005-05-01 10:04:12 +0700

+++ crack-attack-1.1.15-cvs-01/src/gtk-gui/gui_main.cxx	2006-06-02 10:38:40 +0700

@@ -50,6 +50,18 @@

 int glut_argc;

 char **glut_argv;

+/* 

+ * Call this when the window is unexpectedly destroyed to make sure the

+ * hidden gui process doesn't hang around in the background.

+ */

+static void destroy_window(GtkObject *object, gpointer data) {

+#ifdef DEVELOPMENT

+	g_print("\nOh no! We've been unexpectedly destroyed! :(\n");

+#endif

+	gtk_main_quit();

+}

+

+

 /*

  * Documentation

  *   html tables don't work right in explorer

@@ -76,6 +88,8 @@

     winCrackAttackSplash = create_winCrackAttackSplash ();

 		gui_data_read(winCrackAttackSplash);

     gtk_widget_show (winCrackAttackSplash);

+		g_signal_connect(GTK_OBJECT(winCrackAttackSplash), "destroy",

+				G_CALLBACK(destroy_window), NULL);

     gtk_main ();

   return 0;