[Bug libstdc++/69266] bootstrap failure undefined reference to `std::basic_ios >::

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69266

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
https://gcc.gnu.org/ml/gcc-testresults/2015-12/msg01653.html seems to have
worked ok