make check build failure (tst-printf-bz18872)

[Carlos O'Donell]

On 10/08/2015 06:24 PM, Roland McGrath wrote:
>> In that case it should be OK (but maybe we should be consistent, in 
>> whatever direction, about when such rules are / aren't conditionalized).
> 
> I think consistency is good.  I think we should favor not conditionalizing
> anywhere that we do not have to, just to reduce clutter in the makefiles.

+1.

c.