NAN code

I have changed the NAN code, so if NAN is not defined, we just use 'num'
as NAN, since we only get here if num is NAN.  Seems like a good fix for
platforms that can't assign a NAN to a variable.

---------------------------------------------------------------------------
   if (NUMERIC_IS_NAN(num))   {       result = (float32)palloc(sizeof(float32data));
#ifdef NAN       *result = NAN;
#else       *result = num;
#endif       return result;   }

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