[RFA] Add LDD_FOR_TARGET, fix prelink regexp

[Doug Evans]

On Fri, Aug 2, 2013 at 2:00 AM, Pedro Alves <palves@redhat.com> wrote:
> On 08/01/2013 11:19 PM, Doug Evans wrote:
>
>> Ok to check in?
>
> FWIW, I read it, and it looks good to me.
>
> Should LDD_FOR_TARGET be documented somewhere though?

There are several FOO_FOR_TARGET variables in future.exp and none are
documented.
Let's leave documenting them for another day.