[issue40422] Light refactor: create a common _Py_closerange API

[Kyle Evans]

New submission from Kyle Evans <kevans at FreeBSD.org>:

Such an API can be used for both os.closerange and subprocess, re-using much of os_closerange_impl. Pull request enroute.

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components: C API
messages: 367530
nosy: kevans91
priority: normal
severity: normal
status: open
title: Light refactor: create a common _Py_closerange API
type: enhancement
versions: Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40422>
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