[Cin] pcm bluray encoding

[Andrew Randrianasulu]

Thanks to Paul (who wrote a lot of ffmpeg code) I hacked this patch against
ffmpeg-4.4.

Can anyone test how it work with 5.1 and stereo sounds (s16, s24 broken
ATM), especially if it remaps 5.1 channels correctly?

I tested like this:

$ ./ffmpeg -i ~/matrixbench_highdivx_ac3.avi -c:v libx264 -s 160x120 -c:a
pcm_bluray -mpegts_m2ts_mode 1 -sample_fmt s16 1.m2ts

mpv 1.m2ts

but my tablet sound definitely not 5.1!

NOTE: this is not yet cinelerra-gg patch, just something I test with our
version of ffmpeg
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