[3.6] bpo-41100: Support macOS 11 when building (GH-21113) #21155

[phrfpeixoto]

(cherry picked from commit 8ea6353)

Co-authored-by: Ronald Oussoren ronaldoussoren@mac.com

https://bugs.python.org/issue41100

https://bugs.python.org/issue41100

[the-knights-who-say-ni]

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[ned-deily]

Thank you for the PR but, per longstanding policy (as described in PEP 602 and the Developer's Guide, once a release branch reaches the security-fix-only phase of its life cycle, only security-related fixes are accepted for it. In particular, we no longer support newer releases of operating systems and third-party libraries used by Python. Python 3.6 has been in security-fix-only mode since the end of 2018 and will reach end of life at the end of this year. We strongly encourage everyone to use a fully supported version of Python and at the moment that would be Python 3.9.2 which does support macOS Big Sur. Note also that, while this change gets past obvious build errors, the resulting Python 3.6 would still not work entirely correctly on Big Sur.