gh-148675: Revert GH-146237 and GH-146241

[skirpichev]

---

📚 Documentation preview 📚: https://cpython-previews--148674.org.readthedocs.build/

• Issue: Add support for numpy buffer format Zf and Zd #148675

[vstinner]

I merged my change PR gh-148676 which adds Zf/Zd formats to array, ctypes, memoryview and struct. It created many conflicts with this PR.

So I created PR gh-149368 to remove F and D formats from array and memoryview: it's similar to this change but it leaves Zf/Zd in place.

[skirpichev]

I merged my change PR #148676

Shouldn't this be approved by some other core developer?

[vstinner]

Usually, yes, I prefer to wait for an approval of another core dev. In this case, I rushed to merge the PR to make sure that it lands into Python 3.15 alpha1. I don't like working under pressure like that. I hope that we will time to digest these changes and cleanup the code and the doc before Python 3.15 final.