[Bug c++/65255] std::thread does not work for cross compiling on ARM

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65255

--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #8)
> I have a patch for std::thread which would mean it doesn't use shared_ptr,
> so this wouldn't be a problem even if you don't use the same arm version.

This change was made for GCC 6.1, see PR 65393