optim: replace usage of os.sysconf for Windows

[eddiebergman]

See issue #100 and the workaround with #103

os.sysconf only exists on Unix systems (which I think includes Mac).

Need a more windows specific way to do this. Hopefully you don't need to go down the route of using the win32 lib

[LennartPurucker]

Solved in #103

It will be part of the next hotfix in Pip.

[eddiebergman]

Not fully solved, this issue is meant to indicate that a real fix is needed. Here's some little research:

https://chatgpt.com/share/677f9cbe-7ce8-8009-90c6-ed3b9a0d5801

I don't want to just add a new dependancy (although psutil is high quality and pretty regular), and the ctypes solution I would want to test properly on a windows machine but I do not have one readily available.