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Crash/memory corruption with IOCP ioqueue when unregistering active socket

Crash/memory corruption with IOCP ioqueue when unregistering active socket: a task in LegoFlow-SWE (Harbor dataset). Environment: Windows, PJLIB using the default WinNT IOCP backend ( PJ IOQUEUE IMP IOCP ).

The task

**Environment:** Windows, PJLIB using the default WinNT IOCP backend (`PJ_IOQUEUE_IMP_IOCP`).

Part of Lego-X/LegoFlow-SWE.