mmm maybe even like second patch? (adds printing libav version to our startup banner)

Another patch tries to add cinelerra-cv team copyright, I hope I did layout and dates themselves correctly!

вс, 27 авг. 2023 г., 15:28 Andrew Randrianasulu <randrianasulu@gmail.com>:

So, few more lines showing our libav version (there is no differentiation between patched and unpatched ffmpeg yet, but at least you can see if build was done against specific API version)