* Try if new compiling method works
* fix yaml
* need 3.8 on macos for arm
* let's see if we can detect cross-compiling
* test is too late
* huh
* Try to detect cross-compiling
* Remove test harness
* Only apply heuristics when running in cibuildwheel
* Be smarter
* Pin wheel builder to macOS 10.15
11 does not support Python 3.6 and AFAIU, it's better to build on old
platforms.
https://github.com/actions/virtual-environments/issues/4060
* Fail if no wheels are found
* Explain macOS pin
