[issue20221] #define hypot _hypot conflicts with existing definition

[Zachary Ware]

Zachary Ware added the comment:

Ok, I had missed that the warnings in your two separate cases were in fact different.  I still don't understand why VC++ sees the two cases so differently (throwing different warnings), but it at least explains the different results in your two cases.

I don't see how this change can actually break anything, so I'll go ahead and commit so this makes it into 3.3.5 (and hopefully 3.4.0, but that will be up to Larry Hastings).

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<http://bugs.python.org/issue20221>
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