Updated LAV Filters to 0.61.2-5-7a393d4 (custom build based on stable version 0.61.2)

Important changes:
 - LAV Splitter: Improved AviSynth support.
 - LAV Video: Decoding H.264 streams with a resolution change using the DXVA2 Copy-Back decoder could crash.
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coverity.bat: Prefer 7-Zip for packages.
??
SubPic queue: Clear queue only when it's needed.

Time can decrease even within the same video frame and
it make no sense to purge whole queue, if we still can reuse buffered
subpic.