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

[Mark Mitchell]

Eric Botcazou wrote:
>>Personally, I think we should default to not installing libiberty.a,
>>though we should install libiberty.so if we build it.
> 
> 
> And fix PR other/16513 in the process.

It's presumably a matter of adding the right libiberty configure option 
from the top-level by default.  Would you care to take a try?  It sounds 
like Ian would probably approve it, or maybe one of our build 
maintainers would.

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Mark Mitchell
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