[PATCH, nds32] Exclude building gdb for nds32*-*-* target.

[Joel Brobecker]

> 2014-09-05  Chung-Ju Wu  <jasonwucj@gmail.com>
> 
>         * configure.ac (nds32*-*-*): Disable gdb.
>         * configure: Regenerated.
> 
> Is the updated patch OK to commit?

Thank you. Please go ahead and push.

-- 
Joel