gh-152433: Windows: _winapi.c implement GetVersion() UWP alternative

[thexai]

Windows: _winapi.c implement GetVersion() UWP alternative.

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

[chris-eibl]

LGTM.

I hardly think this will have any user on XBOX, though, and even on Desktop the main usage was for subprocess to check whether we're on Win9x

cpython/Lib/subprocess.py

Lines 1030 to 1033 in 23bba4c

	if (_winapi.GetVersion() >=0x80000000or
	os.path.basename(comspec).lower() =="command.com"):
	# Win9x, or using command.com on NT. We need to
	# use the w9xpopen intermediate program. For more

which has been ripped out a while ago. IOW, it is not used in the Python codebase itself anymore (but there might be users out there, even though starting with an underscore and GetVersion "lying" at you when running in compatibility / manifested mode).

[zooba]

GetVersion "lying" at you when running in compatibility / manifested mode

Well, other stuff that's typically directly linked to the version number also gets changed, so if you are trying to detect whether some API behaves a certain way by checking the version number, then you'll want the reported version number to match the compatibility shims that you're getting when you call the API. It's only a lie if your goal is to print the current version to a human, which is why the platform module is separate.