[Cin] zscale's tonemapping on input

[Andrea paz]

> ...so you need to pass switch (
> --enable-libzimg) to ffmpeg's configure script. And of course have zimg development files installed. (I tested on 3.0.4)
Previously I had tried '--enable-libzimg' in configure but it was not
recognized.
Now I tried: export FFMPEG_EXTRA_CFG=' --enable-libzimg' and it was
recognized. However, the compilation stops with this error:

ERROR: zimg >= 2.7.0 not found using pkg-config

I already had the zimg 3.0.5-1 package in the system.

I attach the entire cin.log.
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