Make serial fd blocking mode depend on FILE_FLAG_OVERLAPPED

[Mike McCormack]

This patch causes a serial port's fd to be put into blocking mode if
FILE_FLAG_OVERLAPPED is not specified and non-blocking mode if  it is.

ReadFile should block on serial ports for non-overlapped reads. The
next step is to refuse overlapped reads and writes if the file isn't
opened with FILE_FLAG_OVERLAPPED specified.

Mike


ChangeLog:
* make serial fd blocking mode depend on FILE_FLAG_OVERLAPPED 



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