[Experimental] Clone numba get_nvvm_path()

[rwgk]

Experiment related to #441, triggered by this comment (by @kkraus14).

Context: Potentially use this code from cuda_bindings/cuda/bindings/_internal/nvvm_linux.pyx

This PR: Stripped-down (and ruff'ed) copies of:

• https://github.com/NVIDIA/numba-cuda/blob/bf487d78a40eea87f009d636882a5000a7524c95/numba_cuda/numba/cuda/cuda_paths.py

• https://github.com/numba/numba/blob/f0d24824fcd6a454827e3c108882395d00befc04/numba/misc/findlib.py

Tested interactively with:

import cuda_paths
nvvm_path = cuda_paths.get_nvvm_path()
print(f"{nvvm_path=}")

Output:

nvvm_path=_env_path_tuple(by='System', info='/usr/local/cuda/nvvm/lib64/libnvvm.so.4.0.0')

Advantage of this approach: Battle-tested and time-tested.

Disadvantages: TBD @leofang

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