[issue15477] test_cmath failures on OS X 10.8

[Ned Deily]

Ned Deily added the comment:

I built Python at 3fba718e46e5 on both 10.8 and 10.9 which was just before your changes for this issue went in, Mark.

On 10.8: test_cmath fails and:
>>> math.log1p(-0.0)
0.0
And, indeed, on 10.9, it passes and:
>>> math.log1p(-0.0)
-0.0

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<http://bugs.python.org/issue15477>
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