gcc.dg/compat/struct-layout-1.exp does not supported installed-compiler testing

[Mark Mitchell]

Richard Guenther wrote:

>>Personally I think this change comes under the "obvious" rule, given
>>Mark's change yesterday to not link against libiberty.
>  
> Done.

Yes, this is an obvious patch; thank you.  I did not notice this problem 
because my machine does have a libiberty.h installed.  Would you please 
apply your patch to 4.0 as well, or, if you don't have time, let me know 
so that I can do that?

Thanks,

-- 
Mark Mitchell
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