[issue14300] dup_socket() on Windows should use WSA_FLAG_OVERLAPPED

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

Which problem are you trying to solve?
Can this change be tested somehow?

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nosy: +amaury.forgeotdarc

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<http://bugs.python.org/issue14300>
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