[Bug libstdc++/64967] [5 Regression] Bootstrap fails due to errors in libstdc++ sources with `--enable-symvers=gnu-versioned-namespace'

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64967

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Looks reasonable.