packaging: build Windows with libopenblas

[nilason]

Build Windows package with libopenblas, this addresses a missing change of d5bb442.

As tested and reported with #4485.

[echoix]

Note that our CI doesn't test this. It uses the other script. That's why I had a separate PR in my fork for it. echoix#286 and echoix#285

[nilason]

What is broken, can’t be broken. ;)
I’m confident of these changes.

[echoix]

What is broken, can’t be broken. ;)

I’m confident of these changes.

Haha, I like that!

[nilason]

The OpenMP fix jef-n/OSGeo4W#24 is merged, this one remains to be merged (and relevant changes added to https://github.com/jef-n/OSGeo4W). With these changes, the Win build will hopefully (and probably) be working again. Please consider approve this, as to be able to find out as soon as possible with next build attempt.

[echoix]

This will probably break the patch from grass-dev too, so we might not get a new build for grass-dev
Sorry I didn't see that both grass and grass-dev were changed, I only saw grass

[nilason]

Thanks!

(The OpenMP fix is for both main and releasebranch_84, this OpenBLAS fix is for main only.)