[issue26643] regrtest: rework libregrtest.save_env submodule

[Roundup Robot]

Roundup Robot added the comment:

New changeset c5944a76697b by Victor Stinner in branch '3.5':
Issue #26643: Add missing shutil resources to regrtest.py
https://hg.python.org/cpython/rev/c5944a76697b

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nosy: +python-dev

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