[issue39847] EnterNonRecursiveMutex on win32 can hang for 49.7 days: use GetTickCount64() rather than GetTickCount()

[And Clover]

And Clover <and at doxdesk.com> added the comment:

Yep, should be straightforward to fix (though not to test, as fifty-day test cases tend to be frowned upon...)

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39847>
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