[Bug testsuite/111883] Wstringop-overflow-6.C FAILs with -std=c++26

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111883

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2023-10-20

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Ah yes, std::to_string(float) needs to use std::to_chars in C++26, so includes
<charconv>.

The patch in comment 3 looks correct, feel free to push it if it passes tests.