[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 #4 from Jamaika <lukaszcz18 at wp dot pl> ---
https://github.com/gabime/spdlog/blob/v1.x/example/example.cpp
```
for %%f in ("example.cpp") do g++.exe -v -std=gnu++20 -march=x86-64-v2
-ftree-vectorize -g0 -O3 -fPIC -mavx -mxsave -mpclmul -maes
-DSPDLOG_USE_STD_FORMAT=1 -c %%f -o %%~nf.o
```