ddraw/tests: Skip the primary palette tests if the 640x480x8 mode is not supported.

[Henri Verbeet]

On 12 February 2014 10:28, Francois Gouget <fgouget at codeweavers.com> wrote:
>      hr = IDirectDraw_SetDisplayMode(ddraw, 640, 480, 8);
> +    if (hr == E_NOTIMPL)
> +    {
> +        win_skip("8bpp display mode is not supported\n");
> +        DestroyWindow(window);
> +        return;
> +    }
Is this for the Win 8 testbot? Unsupported display modes should return
DDERR_UNSUPPORTED, and 640x480 at 8 bpp should pretty much always be
supported. Does changing display modes work at all on that VM? IIRC it
had more issues with changing display modes, and not just in the ddraw
tests.