[x265] reference patch for small skip block on black scene

[chen]

The x265 output small block in full black sequence (e.g. first part in big_buck_bunny_360p24.y4m)
The reason are our fast cuDepth decide algorithm not detect Intra mode in previous frame. In the Intra Frame, the maximum block size is 32x32, it made a restrict on next Inter that can't beyond 32x32.
The patch just a little improve on PSNR and bitrate, so reference only.

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