[issue43725] Create a release branch ABI stability regression test

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:

I assume it's only doing source analysis, so we can probably force those flags on for the check? Or run multiple checks with the options, but without having to switch platform.

Even under MS_WINDOWS, I hope we're not using declarations from the Windows header files in our own public API. If so, those are worth replacing (safely, over time).

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