gh-152433: Windows: allow build prim.c for UWP

[thexai]

All changes are trivial:

Remove some run-time dynamic linking and replace some LoadLibrary with LoadPackagedLibrary for UWP.

• Issue: Windows: improve compatibility to build for UWP / Xbox #152433

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[chris-eibl]

LGTM considering @zooba's #152433 (comment).

cc @colesbury who tracks mimalloc differences from upstream in #113141.

[zooba]

This change looks fine, if we're maintaining the sources separately. If we're trying to track upstream closely, then we'll need them to make the change first. That's @colesbury's call, it seems.

[zware]

Our copy of mimalloc is fairly out of date at this point, and does carry several patches against the equivalent upstream version. Regardless, I think we should be sure that this is done upstream before we merge it ourselves, or it's likely to be lost if and when we update our copy -- ideally, when we do such an update we can do it without carrying any patches forward.

[colesbury]

Yeah, if it's not CPython specific, please also open a PR in upstream mimalloc.

[thexai]

Patch submitted to upstream (microsoft/mimalloc#1340).

Note is a bit different because GetNumaHighestNodeNumber thing is already addressed in current version and only replaced LoadLibrary for better code portability (to very old Windows versions).

I think PR can still be merged here because it doesn't do any harm and in the future it will be overwritten by whatever is upstream.

[zooba]

Not sure it's a major issue, but wouldn't GetModuleHandle be the better option? There's 0% chance we've reached this point without these module being loaded, and as they're not packaged libraries I would expect this to fail without the "it's already loaded" fast-path.