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
This commit is contained in:
Lukas Wöhrl
2016-11-17 20:41:46 -08:00
committed by Facebook Github Bot
parent 4f192481ee
commit 542fc50409

View File

@@ -14,7 +14,9 @@
#ifdef _MSC_VER
#include <float.h>
#ifndef isnan
#define isnan _isnan
#endif
#ifndef __cplusplus
#define inline __inline