[Bug c++/109688] SPDLOG build fails with C++20 and -DSPDLOG_USE_STD_FORMAT=1

[rs2740 at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109688

TC <rs2740 at gmail dot com> changed:

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                 CC|                            |rs2740 at gmail dot com

--- Comment #6 from TC <rs2740 at gmail dot com> ---
https://cplusplus.github.io/LWG/issue3636 clarifies that formatter<T>::format
must be const, which is not the case in that example.