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Fix lib64 site-packages not added to sys.path on Fedora/RHEL (#942)

## Summary

- On Fedora/RHEL, Python venvs use `lib64/` for C extension packages
instead of `lib/`
- `PythonEnv._get_site_paths()` only yielded
`lib/pythonX.Y/site-packages/`, so packages like `coverage` were
invisible despite successful pip installation
- Add `lib64/pythonX.Y/site-packages/` to site paths when the directory
exists

Fixes #940

## Test plan

- [x] All 642 unit tests pass
- [x] All 56 integration tests pass (was 54/56 before —
`issue_862_tests` and `smoke_analyze_tests` now pass)
- [x] Verified `coverage` is found in `lib64/` site-packages on Fedora
with system Python

1388 of 1856 branches covered (74.78%)

Branch coverage included in aggregate %.

5533 of 6528 relevant lines covered (84.76%)

0.85 hits per line