[Bug 53130] New: ntdll:threadpool - test_tp_instance() fails (rarely) on Windows 8+

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=53130

Bug ID: 53130
           Summary: ntdll:threadpool - test_tp_instance() fails (rarely)
                    on Windows 8+
           Product: Wine
           Version: unspecified
          Hardware: x86-64
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ntdll
          Assignee: [e-mail]
          Reporter: [e-mail]

ntdll:threadpool - test_tp_instance() fails (rarely) on Windows 8+:

threadpool.c:1170: Test failed: WaitForSingleObject returned 0
threadpool.c:1210: Test failed: WaitForSingleObject returned 258

https://test.winehq.org/data/patterns.html#ntdll:threadpool

These two failures always go together.

The failure is pretty rare, about 4.1%, so it can easily be missing from a test
configuration's WineTest runs which results in false positives.