[Cin] libav version in About prefs [patch]

[Andrea paz]

Now the compilation takes place without errors. However, I don't have
the cin file inside bin: it is not possible to start CinGG.
CIN_CONFIG=/home/paz/.bcast6 /home/paz/cinelerra5/cinelerra-5.1/bin/./cin
bash: /home/paz/cinelerra5/cinelerra-5.1/bin/./cin: No such file or directory

I attach yet another cin5.log
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