[Bug libstdc++/69881] with gcc-6 of today building gcc-4.9 fails

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69881

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The patch seems wrong, your new sections don't add anything to namespace std.