don't support WaitCommEvent's EV_TXEMPTY

[Mike McCormack]

This patch removes broken support for WaitCommEvent's EV_TXEMPTY flag.
EV_TXEMPTY ends wait when the last character in the TX buffer is
written. POLLOUT ends wait
whenever the fd can be written to. These are not the same.

ChangeLog:
* server/serial.c
  Remove broken support for EV_TXEMPTY because it causes
  busy loops.



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