Lukas Wöhrl fb4d9f204a do not redefine isnan if already defined via math.h
Summary:
```isnan``` is already defined in ```math.h``` (at least when using VS13) so there is no need to redefine it. it also is a nan for float and not for double opposed to ```_isnan```
Closes https://github.com/facebook/css-layout/pull/253

Reviewed By: emilsjolander

Differential Revision: D4199331

Pulled By: splhack

fbshipit-source-id: 139fb0efd68dd5df79bbaef863a8e8b9246c795d
2016-11-17 20:43:44 -08:00
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