Partial Backport of 'Add support for Apple silicon': Fix Big Sur detection
XCode's python returns 11.0 Homebrew's python returns 10.16
Fixes #311 (closed)
Partial backport of !661 (merged) for 1.18.2
Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
XCode's python returns 11.0 Homebrew's python returns 10.16
Fixes #311 (closed)
Partial backport of !661 (merged) for 1.18.2