Revert "Build wheels for ppc64le"

[jpivarski]

Reverts #1224

@chrisburr I should have done a manual CD test, first. It didn't deploy: https://github.com/scikit-hep/awkward-1.0/actions/runs/1724731128

I'm reverting this to release 1.8.0rc3. We'll revisit it!

[chrisburr]

Ah I think it fails to test because numpy doesn't have ppc64le wheels (when I tested numpy was already installed so I didn't notice). It seems it's on the roadmap but I guess it'll have to wait for now unless you'd consider releasing untested ppc64le wheels?

[jpivarski]

Okay, that explains it. If NumPy doesn't have PowerPC wheels, I don't think it helps much for Awkward to have PowerPC wheels because PowerPC users would have to compile something, anyway. (I'm assuming that it's at least as hard to compile NumPy as Awkward.) When they do, we can reinstate this, though.

[chrisburr]

If NumPy doesn't have PowerPC wheels, I don't think it helps much for Awkward to have PowerPC wheels because PowerPC users would have to compile something, anyway.

Numpy is a fairly standard thing to find pre-installed so I think in most cases it's probably not an issue.

[jpivarski]

I see—you're thinking it would come from the OS distribution's package manager. (I used to do that, but now I always get it from pip or conda. I don't trust my OS distribution's package manager for any Python packages.)

If it's reintroduced into the Awkward build, then GitHub Actions would have to compile NumPy, which isn't terrible, but it's a slow-down. It's not something we'd want to have happen in regular CI builds, though maybe a CD release.