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
  maillist@candle.pha.pa.us            |  (610) 853-3000
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