Updated LAV Filters to 0.59.1-22-a6514fd (custom build based on 0.59.1-17-6da6023).

Important changes:
 - LAV Video: Fix a crash with DXVA on AMD cards when stopping playback (fixes #3601).
 - LAV Audio: Fix a crash when using old versions of the ArcSoft DTS Decoder to handle DTS decoding internally (fixes #3676).
Internal filters: Support WMV splitting, enabled by default
Use conversion constructors to work-around confusing AStyle styling.
Use a bitcheck instead of casting (WIP).

Fixes CID #965944.