opengl/tests: Skip tests if we can't find a pixel format.

[Huw Davies]

On Fri, Dec 05, 2008 at 03:25:56PM +0100, Paul Vriens wrote:
> This looks a bit strange:
> 
> +        if(iPixelFormat == 0)
> +        {
> +            todo_wine ok(iPixelFormat > 0,
> 
> 
> Is it your intention to just throw up a failed message in all cases?

Hi Paul,

It was my intention to throw a todo if ChoosePixelFormat rets 0 when
run under Wine.

Huw.