Update LAV Filters to version 0.58.2-45-gf93cb2e

Important changes:
 - This update fixes an issue with LAV Audio Decoder mixer feature (fixes #3348).
 - This update fixes an issue with LAV Video Decoder where some Xvid files showed corruption (fixes #3368).
 - LAV Splitter can now connect to the VTS Reader source filter (used to open IFO files).