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

[lukaszcz18 at wp dot pl]

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

--- Comment #3 from Jamaika <lukaszcz18 at wp dot pl> ---
SPDLOG claims that MSVC compiles.