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

[Gregory P. Smith]

New submission from Gregory P. Smith <greg at krypto.org>:

On POSIX platforms that support the fdwalk() API, use it within the os.closerange() implementation.

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components: Demos and Tools
messages: 351875
nosy: gregory.p.smith
priority: normal
severity: normal
stage: patch review
status: open
title: Use fdwalk() within os.closerange() impl if available
type: performance
versions: Python 3.8, Python 3.9

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