Avoid D3D9 fallback on lack of codec support unless a D3D11 FL11.0 GPU wasn't found

We'd rather not waste time (and risk crashes) loading the D3D9 driver if the GPU doesn't have the physical decoding hardware at all.

app/streaming/video/ffmpeg.h

@@ -55,6 +55,7 @@ private:
                                enum AVPixelFormat requiredFormat,
                                PDECODER_PARAMETERS params,
                                const AVCodecHWConfig* hwConfig,
+                               IFFmpegRenderer::InitFailureReason* failureReason,
                                std::function<IFFmpegRenderer*()> createRendererFunc);
 
     static IFFmpegRenderer* createHwAccelRenderer(const AVCodecHWConfig* hwDecodeCfg, int pass);