bpo-41100: deploy to an earlier version of macOS#21583
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These are most of the C changes needed to build on macOS 11.0 and deploy to macOS 10.9 (and technically even earlier, this should even work back to macOS 10.6).
This patch is currently in a very rough state and is incomplete.
TODO:
NOTE: This should be merged with PR21577, which does something similar but only back to macOS 10.10.
https://bugs.python.org/issue41100