This means that the MPS no longer supports Windows XP, so update documentation accordingly.
Exercise the global locks in lockut.
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Change: 194253
Implementations testthrix.c for Unix and testthrw3.c for Windows.
Multi-threaded test cases use the new interface.
Rename lockutw3 to lockut (no longer Windows-specific).
Run multi-threaded test cases on Windows and lockut elsewhere.
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Change: 185350
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