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;
}

--
Bruce Momjian | http://www.op.net/~candle
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