Unreviewed libstdc++ patch

[Rainer Orth]

The following patch

        libstdc++: Update Solaris baselines for GCC 13.0
        https://gcc.gnu.org/pipermail/gcc-patches/2023-February/612379.html

has remained unreviewed for a week.

Thanks.
        Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University