fate: Invoke standard lavfi tests through fate-run.sh

tests/fate-run.sh

tests/fate/avfilter.mak

tests/fate/filter-video.mak

tests/lavfi-regression.sh

tests/ref/fate/filter-crop

tests/ref/fate/filter-crop_scale

tests/ref/fate/filter-crop_scale_vflip

tests/ref/fate/filter-crop_vflip

tests/ref/fate/filter-null

tests/ref/fate/filter-scale200

tests/ref/fate/filter-scale500

tests/ref/fate/filter-vflip

tests/ref/fate/filter-vflip_crop

tests/ref/fate/filter-vflip_vflip