HACK: Disable VSync option for Haiku

desktop_version/src/Game.cpp

@@ -6852,7 +6852,9 @@ void Game::createmenu( enum Menu::MenuName t, bool samemenu/*= false*/ )
         option("toggle filter");
         option("toggle analogue");
         option("toggle fps");
+#ifndef __HAIKU__ // FIXME: Remove after SDL VSync bug is fixed! -flibit
         option("toggle vsync");
+#endif
         option("return");
         menuyoff = -10;
         break;