[Cin] libav version in About prefs [patch]

[Andrea paz]

I put in the latest patch and, it seems to me, everything is fine.
I did the following tests:

A) appimage (without patches):

1- with "try ffmpeg first"
2- with "try ffmpeg last"

I append tiff_appimage.txt

B) build + patches + ffmpeg.git

1- with "try ffmpeg last"
2- with "try ffmpeg first"

I append tiff_build_patch.txt

My conclusion: there are far fewer messages in the terminal and there
are not the errors of yesterday without the latest patch. It seems to
me that you have done a very good job....
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