[issue18643] add a fallback socketpair() implementation in test.support

[Roundup Robot]

Roundup Robot added the comment:

New changeset 6098141155f9 by Charles-François Natali in branch 'default':
Issue #18643: Add socket.socketpair() on Windows.
https://hg.python.org/cpython/rev/6098141155f9

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