[3.9] bpo-41100: Support macOS 11 and Apple Silicon (GH-22855)#23295

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ronaldoussoren merged 3 commits intopython:3.9from

ronaldoussoren:backport-4176193-3.9

Nov 22, 2020

Commits on Nov 15, 2020

[3.9] bpo-41100: Support macOS 11 and Apple Silicon (GH-22855)
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Back port of changes to _decimal to support arm64
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Commits on Nov 21, 2020

temp_dir is in test.support in 3.9
ronaldoussoren
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