[Bug c++/67478] gcc-5.1.0/gcc-5.2.0 undefined symbol std::__once_callable in AIX 6.1

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67478

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Oh sorry, I missed that was in your first comment! Checking it now...