[issue18643] implement socketpair() on Windows

[Charles-François Natali]

Charles-François Natali added the comment:

Since I'll update socket tests to also use support.PIPE_MAX_SIZE, maybe we should rename this variable while we're at it?
Anybody can think of a name that would work both for sockets and pipes?

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nosy: +pitrou

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<http://bugs.python.org/issue18643>
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