[issue45254] HAS_SHMEM detection logic is duplicated in implementation and tests

[Nikita Sobolev]

Change by Nikita Sobolev <mail at sobolevn.me>:


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components: +Tests
versions: +Python 3.10, Python 3.11, Python 3.8, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45254>
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