Static LLVM 23.1.3 libraries used to build libfaust (assertions off,
no system dependency), built by the build-llvm workflow from af80ce9:
https://github.com/grame-cncm/faust/actions/runs/39326224095
Each archive extracts to llvm/ and contains BUILDINFO.txt. Copy SHA256SUMS
into .github/llvm/SHA256SUMS for libfaust.yml to accept these archives.