[pdal] compile error isnan and isinf

[Howard Butler]

Fixed.

https://github.com/PDAL/PDAL/commit/8e21113523df56c80a8b3f8cf1820e60c3b24641


> On May 21, 2016, at 10:58 AM, Stefan Ziegler <stefan.ziegler.de at gmail.com> wrote:
> 
> Hi
> 
> I get some compile errors with isnan/isinf methods:
> 
> error: ‘isnan’ was not declared in this scope
> 
> Using "std::inan" and "std::isinf" instead works. I'm on Ubuntu 16.04.
> 
> regards
> Stefan
> 
> 
> 
> 
> 
> 
> 
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