[issue35433] Correctly detect installed SDK versions

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:

Both io.h and stddef.h are from the UCRT, which *may* go through a different detection process than the rest of the WinSDK. That might be the cause.

The "didn't find any supported SDKs" behavior is to try and use the earliest, which should fail, but all the others were going to fail too. I wonder if checking the installed UAP platform data is the wrong check, and we should look for a specific Include file instead?

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<https://bugs.python.org/issue35433>
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