[issue38110] Use fdwalk() within os.closerange() impl if available

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

contribution from Jakub Kulík (see the PR)

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assignee:  -> gregory.p.smith

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38110>
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