libavif 1.4.0 does not compile successfully with CMake < 3.24

[radarhere]

After python-pillow/Pillow#9460 upgraded libavif to 1.4.0, main has started failing for Amazon 2023 and Ubuntu 22.04 - https://github.com/python-pillow/docker-images/actions/runs/22924010099

298.3 CMake Error at _deps/libaom-src/CMakeLists.txt:383 (target_link_libraries):
298.3 Error evaluating generator expression:
298.3
298.3 $PATH:ABSOLUTE_PATH,/depends/libavif-1.4.0/_deps/libaom-src,/
298.3
298.3 Expression did not evaluate to a known generator expression

I asked, and libavif have confirmed this as a bug - AOMediaCodec/libavif#3095

For the moment, I think the simplest solution is to just not install libavif in those jobs.

Also, now that python-pillow/Pillow#9460 reverted python-pillow/Pillow#9413, patch from #257 is no longer needed, and that can be reverted.