[v3] libstdc++/49829

[Benjamin Kosnik]

> > OK. The attached is closer, but still not quite there.
> 
> one step further, to avoid the endless recursion in the install-debug
> target. unsure if that is the right approach. the install now works,
> but the debug library is now built in the install step, not in the
> build step.

As checked in.

tested x86/linux

-benjamin
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