When `MACOSX_DEPLOYMENT_TARGET` is not set by the user, cibuildwheel always defaults to `10.9`.
This leads to warning when building arm64 wheels.
This commit removes the warning by setting the default to `11.0` for arm64 builds.
Per discussion in https://github.com/pypa/cibuildwheel/pull/1169, the default installer used for cp38 is an Intel installer.
It makes sense to skip testing arm64 wheels in this case.
However, if the user choose to manually install the universal2 CPython version, then, tests shall be run on arm64.
This allows users that either target 11.0+ on intel, universal2 or only build for arm64 to get the arm64 wheel tested on AppleSilicon.
* change check_call to run
* refactor: change check_output to run
* Apply suggestions from code review
Co-authored-by: Joe Rickerby <joerick@mac.com>
Co-authored-by: Joe Rickerby <joerick@mac.com>