fix for Lawson's CLOCAL problem

[Mike McCormack]

Right. Here's this bit. Lawson tested it and it fixes his problem.

>I don't know if this was Lawson problem, but open() can potentially
>block on a serial port, and we cannot have that in the server; so
your
>change to set O_NONBLOCK is good, but it shouldn't depend on
>FILE_FLAG_OVERLAPPED.

ChangeLog:
* unconditionally set O_NONBLOCK when opening



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