workaround win32 crash (or error) on SetCommState

[foldl]

I believe there is a bug (a.k.a the crash "OSError: exception: stack overflow") in SetCommState.

Steps to trigger the crash

1. Use some other tools to open a COM port where
   • a large buffer size (e.g. 102400) is configured in SetupComm,
   • set XonLim and XoffLim to (102400 / 4) in SetCommState
2. Close the port;
3. Use pyserial to open the port, or use mode command to reconfigure it.

Test Environment

• JLink CDC COM;
• Latest Windows 10/11.

Expected Behavior

Window may return an error code but not crash if it finds something strange.

Workaround

It seems unrealistic to wait MS to fix this. So here comes the workaround, which might also resolve #258 and #362:

Set XonLim and XoffLim according to buffer size configured in SetupComm.

[foldl]

A detailed analysis:

https://foldl.github.io/2022-10-18-chasing-a-win32-bug/