Make it work on plain Debian

[jcbhmr]

https://github.com/devcontainers-community/features-llvm/actions/runs/5875312127/job/15931397336

[jcbhmr]

maybe investigate https://github.com/rapidsai/devcontainers/tree/branch-23.10/features/src/llvm ?

[njelich]

Is this still active and necessary @jcbhmr ?