The cold-runtime e2e and the uv dependency-leg test ship or digest the host
interpreter as if it were a standalone Python. The earlier skips matched one
file (sitecustomize.py) and one path (/usr), so /usr/local, Homebrew or a
distro stdlib with other absolute links still failed.
Skip instead when the shipped stdlib holds a link tarfile's data filter
refuses, or when the prefix has unreadable files or is far larger than a
single interpreter.
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