[2/5] d3dx9: Implement D3DXSaveSurfaceToFileInMemory.

[Vincent Povirk]

> -    hr = IWICImagingFactory_CreateStream(factory, &stream);
> +    hr = IWICImagingFactory_CreateStream(factory, &wic_stream);
>     IWICImagingFactory_Release(factory);
>     if (FAILED(hr)) goto cleanup_err;
>
> -    hr = IWICStream_InitializeFromFilename(stream, dst_filename, GENERIC_WRITE);
> +    hr = CreateStreamOnHGlobal(NULL, TRUE, &stream);
>     if (FAILED(hr)) goto cleanup_err;
>
> +    hr = IWICStream_InitializeFromIStream(wic_stream, stream);

Why bother creating an IWICStream here? Just use your HGLOBAL stream
to initialize the encoder.