libstdc++ baseline updates for 3.4/HEAD

[Matthias Klose]

Benjamin,

I asked for an update of various *-linux libstdc++ baseline files for
3.4 and HEAD. You replied that the allocator used for some linux
architectures isn't yet decided. Is there any progress? Where are
these issues discussed?

As the 3.4.1 release will not wait for this decision, I would like to
checkin the current *-linux baselines to the 3.4 branch and HEAD. It
doesn't make things worse, things are documented for the current state
and differences between 3.4 and HEAD can be easier followed.

Ok for this update?

Thanks, Matthias