[Cin] ffmpeg upgraded from 4.1 to 4.3 + Thirdparty libraries

[Phyllis Smith]

CinelerraGG git checkin includes the following upgrades and a couple of
fixes:

1) fixed ffmpeg scan remap
2) BT 473 configure.ac patch (noted by ferdnyc with patch)
3) thirdparty libraries updated to include:

ffmpeg from 4.1 to 4.3
turbo-jpeg
vorbis
x265
vpx
lv2
aom
dav1d
nv-codec-headers

No thorough test has been done so just using it helps to make sure there
are no problems.  Thank you, GG/Phyllis
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