Sockets not non-blocking when compiling with MingW

[dnk at bjum.net]

Hello.

When tinc is compiled with MingW, sockets are not made non-blocking
because O_NONBLOCK is not defined anywhere.

This leads to weird timeouts when one or more hosts part of a VPN are
unreachable, because tinc hangs in connect() (and possibly other
places as well).

This guy is probably experiencing this bug:
http://brouwer.uvt.nl/pipermail/tinc/2007-April/001646.html

I've attached a patch that adds some win32-specific code to make
sockets non-blocking. I've been using it for a couple of hours, and
have experienced no problems so far.
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