Version check

src/game.c

@@ -128,7 +128,10 @@ game_loop ()
     draw_field ();
     if (GT_MP_PTP)
         net_game_fillsockaddr ();
-
+	if (strcmp(VERSION,"0.9.9") ) {
+		menu_displaytext ("Error", " Unauthorized version change ", 64, 0, 0);
+		return;
+	}
     SDL_Flip (gfx.screen);
 
     timestamp = SDL_GetTicks (); // needed for time sync.