[issue43428] Sync importlib_metadata enhancements through 3.7.

[Jason R. Coombs]

Change by Jason R. Coombs <jaraco at jaraco.com>:


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keywords: +patch
pull_requests: +23548
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/24782

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43428>
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