[WIP] bpo-41179: Fix ctypes.util.find_library on macOS Big Sur

[sumanthratna]

https://bugs.python.org/issue41179

[the-knights-who-say-ni]

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[sumanthratna]

From @ronaldoussoren at https://bugs.python.org/issue41179:

We're tracking macOS 11 changes in Issue41100. That issue has a PRs from Apple for, amongst others, this issue.

See #21241 and #21249