[issue43517] Fix false positives in circular import detection with from-imports

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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nosy: +brett.cannon, eric.snow, nanjekyejoannah, ncoghlan, serhiy.storchaka

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43517>
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