[3.8] bpo-41100: Support building with new macOS SDK (GH-22855) by isuruf · Pull Request #26474 · python/cpython
GH-25806 was a python 3.8 backport of GH-22855 to support macOS 11,
but didn't backport the changes that enabled building python
with a new macOS SDK and target an older macOS version.
This commit adds support for that.
I'm not sure if the title is correct. It's supposed to have the title from the original PR, but that doesn't seem appropriate here.