Need auditwheel-like utility for other platforms

[steve.dower]

@njs

So we need to rewrite the wheel’s top-level __init__.py and inject some code to add our vendored libs dir to the DLL search path. There are a lot of ways to approach this, they’re all kinda gross, but I think we can hold our noses and make it work in practice.

Hopefully os.add_dll_directory() is the least gross of these I’d be just as happy to see it validate and pass/fail rather than trying to fix anything automatically, though.

As with everyone else, +1 in principle, but not committing my own time to it. I could probably help making a list of the intersection of pre-installed DLLs across clean, supported Windows versions though.