[issue34632] Port importlib_metadata to Python 3.8

[Chih-Hsuan Yen]

Change by Chih-Hsuan Yen <yan12125 at gmail.com>:


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pull_requests: +13475
stage: resolved -> patch review
pull_request: https://github.com/python/cpython/pull/13565

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34632>
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