[issue42476] Allow cross compiling python for macos-arm64 from macos-x86_64

[Ronald Oussoren]

Ronald Oussoren <ronaldoussoren at mac.com> added the comment:

I've added some review comments to the PR. 

Note that cross building like this will not be as well tested by us as regular builds.

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components: +macOS
nosy: +ned.deily, ronaldoussoren

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42476>
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