[PATCH v2] Let fpclassify use the builtin when optimizing for size in C++ mode (bug 22146)

[Gabriel F. T. Gomes]

On 21 Sep 2017, Joseph Myers wrote:

>On Wed, 20 Sep 2017, Gabriel F. T. Gomes wrote:
>
>> 	[BZ #22146]
>> 	math/math.h: Let fpclassify use the builtin in C++ mode, even
>> 	when optimazing for size.  
>
>OK.

Thanks.  Now committed.