Sync pythoncapi_compat

[97littleleaf11]

Related mypyc/mypyc#889

[97littleleaf11]

cc @vstinner @JelleZijlstra Am I doing the right way to update the LICENSE?

[github-actions]

According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉

[JelleZijlstra]

I assume you just copied the file over? This makes sense to me but I don't know much about the C API, so let's also give Victor some time to confirm.

[vstinner]

cc @vstinner @JelleZijlstra Am I doing the right way to update the LICENSE?

I changed pythoncapi_compat license so you don't have to mention pythoncapi_compat license to use it.

Previously, the MIT license required you to mention it. I made a mistake when I copied pythoncapi_compat in mypy, I wasn't aware of the "advertizing" part of the MIT license.

I suggest to leave the LICENSE file unchanged: don't mention pythoncapi_compat license. But you can mention the license if you want :-)

[vstinner]

What is the purpose of this change? To use the 0BSD license instead of the MIT license? If yes, it's a good thing :-) The MIT license must be mentioned in the projects using the old version of pythoncapi_compat (the old version using the MIT license).

[vstinner]

Related mypyc/mypyc#889

This issue was just closed.

[vstinner]

LGTM.