[Bug libstdc++/116070] broken headers for compile with flags -std=gnu++14 -fconcepts

[alexey.lapshin at espressif dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116070

--- Comment #1 from Alexey <alexey.lapshin at espressif dot com> ---
To reproduce compile with options "-std=gnu++14 -fconcepts"