[issue43881] add platform availabity information for os.sched_getaffinity

[Guo Ci Teo]

Change by Guo Ci Teo <zguoci at gmail.com>:


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keywords: +patch
pull_requests: +24185
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/25459

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43881>
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