[Cin] libsvtav1 2.3.0 patch for cmake 4.0

[Andrea paz]

I tested the two patches for x265 and svtav1. Compiling in Arch with
Cmake 4 is OK; a HEVC video in 4k and 60 fps is loaded without errors;
playback gives no errors, but goes at 10 fps and rendering to mkv with
svtav1 gives no errors and renders at 9 fps.
I also tried appimage (CinGG-20250228-x86_64, with Cmake 3) loading
the same video: there are no errors; playback goes at the original 60
fps and rendering with svtav1 goes at 30 fps.
What further tests do you recommend?