Small patch to enable build of gdb-7.6 for GNU/Hurd

[Sergio Durigan Junior]

On Friday, May 24 2013, Svante Signell wrote:

> I will change to use xstrprintf instead. Updated patch with ChangeLog
> entry will follow shortly. Is it OK to modify also the other (preceding)
> function in the same way (for consistency)?

Thanks.  It is OK IMO, but I'd prefer if you did that in a separate
patch.

-- 
Sergio