fix: remove PURGE_RXABORT flag on flush for Windows (#1817)

The PURGE_RXABORT flag causes the ReadFileEx to be cancelled; on
cancellation, the ReadIOCompletion method is called with a non-zero
errorCode.

BREAKING CHANGE: flush behavior on windows no longer cancels inflight reads

packages/bindings/src/serialport_win.cpp

@@ -935,7 +935,7 @@ void EIO_AfterList(uv_work_t* req) {
 void EIO_Flush(uv_work_t* req) {
   VoidBaton* data = static_cast<VoidBaton*>(req->data);
 
-  DWORD purge_all = PURGE_RXABORT | PURGE_RXCLEAR | PURGE_TXABORT | PURGE_TXCLEAR;
+  DWORD purge_all = PURGE_RXCLEAR | PURGE_TXABORT | PURGE_TXCLEAR;
   if (!PurgeComm(int2handle(data->fd), purge_all)) {
     ErrorCodeToString("Flushing connection (PurgeComm)", GetLastError(), data->errorString);
     return;