Set storage class of julia globals to dllimport on windows to avoid auto-import weirdness

[gbaraldi]

Fixes https://github.com/JuliaLang/julia/issues/54550 on 1.10. Master will require a similar but different PR.

[fingolfin]

Just to clarify: This PR targets the backports-release-1.10 branch. Does that means 1.11 and 1.12 are not affected? Or will they get separate fixes?

[gbaraldi]

This is mostly for testing on 1.10 but it's likely this need a similar fix on 1.11 and up

[giordano]

What happened to the history of this PR?

[gbaraldi]

I believe it was the force pushes to the base branch that this targets?

[KristofferC]

Hm, didn't mean to cause that. There were a few commits on the backport branch that were erroneous.