[Bug libstdc++/98319] LFTS headers give errors if included as C++11 or C++98

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98319

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
And for 10.3 as well.