[Bug libstdc++/86272] [6/7/8/9 Regression] __gnu_debug::string uses undefined __glibcxx_check_insert_range2

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86272

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The right fix might be to just remove the line that causes the error, but I
didn't check to see if we've replaced that macro with something different that
we should be using instead.