HANDLE_converter must choose between int on POSIX and void * on Windows; draft this PR until I'll sort out how to properly implement it.

False alarm, underlying pointer processing already does this.

Did this cause some GitHub warnings? E.g. at the end of https://github.com/python/cpython/pull/95253/files there are some warnings like

 Modules/clinic/overlapped.c.h#L40
'=': 'ULONG_PTR' differs in levels of indirection from 'void *' [D:\a\cpython\cpython\PCbuild\_overlapped.vcxproj]

@gvanrossum A two-step fix is ready:

• gh-95417: Add PyLong_FromUintptr_t and PyLong_AsUintptr_t #95446 (need to decide first whether PyLong_*Uintptr_t should be a macro-like inline function or exported from python3.dll/.so)
• gh-95417: Apply a proper fix for previously fast-fixed ULONG_PTR differs in levels of indirection from void * #95518

Can we quick fix it by making AC generate casts for uintptr_t?

@zooba I agree with a quick fix here and now. Here it is:

• gh-95417: Quick fix of ULONG_PTR differs in levels of indirection from void * #95538