Rotation detection and handling should now work across all, publicly-released,
WinRT-based platforms (Windows 8.0, Windows 8.1, and Windows Phone 8.0).
// Register the hint, SDL_HINT_ORIENTATIONS, with SDL. This needs to be
// done before the hint's callback is registered (as of Feb 22, 2013),
// otherwise the hint callback won't get registered.
//
// TODO, WinRT: see if an app's default orientation can be found out via WinRT API(s), then set the initial value of SDL_HINT_ORIENTATIONS accordingly.
//SDL_SetHint(SDL_HINT_ORIENTATIONS, "LandscapeLeft LandscapeRight Portrait PortraitUpsideDown"); // DavidL: this is no longer needed (for SDL_AddHintCallback)
// Register the hint, SDL_HINT_ORIENTATIONS, with SDL.
// TODO, WinRT: see if an app's default orientation can be found out via WinRT API(s), then set the initial value of SDL_HINT_ORIENTATIONS accordingly.