Update LAV Filters to 0.59.1-57-80f1385 (custom build based on 0.59.1-52-0b90b46).

Important change:
 - Update libraries (ffmpeg, libspeex, Opus, opencore-amr).
 - LAV Video decoder: Fix a decoding issue with some H264 files (fixes #3793).

Also fixes #3785.