Small change to libcpp

[Mark Mitchell]

Kean Johnston wrote:
> All,
> 
> I meant to send this to the list but replied only to Gerald
> Pfeifer by mistake. Attached is a patch to the 4.0 branch
> that fixes the bootstrapping with gcc < 3.1 issue. This is
> the same patch that was made to HEAD but ansidecl.h needs
> patching too.

OK for 4.0 branch.

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Mark Mitchell
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