Fix building with SDL_DISABLE_WINDOWS_IME Regression of https://github.com/libsdl-org/SDL/commit/f317d619ccd22e60cebf1b09d716d3985359c981#diff-bff8f3e638d51e86cb6f0f42e2c527549d649951b7aa5ec4a539e865a5b57027R398