Fix _overlapped segfault and missing _winapi constants by youknowone · Pull Request #6907 · RustPython/RustPython

- Fix from_windows_err using new_exception_empty on OSError subclasses
  (ConnectionRefusedError, ConnectionAbortedError), which caused segfault
  in release builds due to debug_assert on type size mismatch
- Move ConnectPipe from instance method to module-level function
- Add Destructor for Overlapped to cancel pending I/O on object cleanup
- Add NMPWAIT_NOWAIT, NMPWAIT_USE_DEFAULT_WAIT, NMPWAIT_WAIT_FOREVER
  constants to _winapi

marked this pull request as ready for review

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