[3.8] bpo-38086: Sync importlib.metadata with importlib_metadata 0.21. (GH-15840) (#15861)

https://gitlab.com/python-devs/importlib_metadata/-/tags/0.21.
(cherry picked from commit 17499d8270)

Co-authored-by: Jason R. Coombs <jaraco@jaraco.com>
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Jason R. Coombs 2019-09-10 15:58:29 +01:00 committed by GitHub
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commit 97c2f68a4c
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8 changed files with 709 additions and 658 deletions

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