[issue12303] expose sigwaitinfo() and sigtimedwait() in the signal module

[Roundup Robot]

Roundup Robot <devnull at devnull> added the comment:

New changeset 768234f5c246 by Ross Lagerwall in branch 'default':
Fix test_signal on Windows after #12303.
http://hg.python.org/cpython/rev/768234f5c246

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<http://bugs.python.org/issue12303>
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