[v3] Regenerate Solaris 2 baselines for GCC 4.6.0 release

[Benjamin Kosnik]

> I think we agreed that it would be useful to regenerate the Solaris 2
> libstdc++ baselines close to the GCC 4.6.0 release, especially given
> that symbol versioning on Solaris appears in 4.6.0 for the first time
> and several symbols have been added to the libstdc++.so ABI since the
> last update.

I agree we should do this for 4.6.0, but I disagree as to what the
exact exports should be.

-benjamin