Fallback to GetThreadGroupAffinity if GetNativeSystemInfo reports wrongly

[isaevil]

Description

For some reason, GetNativeSystemInfo on Windows 11 (or WS2022) systems with multiple processor groups reports information from parent process (for example, when running tests using CTest) even though documentation states that dwNumberOfProcessors is "the number of logical processors in the current group". This patch fallbacks to using GetActiveProcessorCount on group from calling thread's affinity if possible.

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• bug fix - change that fixes an issue
• new feature - change that adds functionality
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• documentation - documentation update

Tests

• added - required for new features and some bug fixes
• not needed

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Breaks backward compatibility

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[dnmokhov]

LGTM