Disable warning about format string

[HazardyKnusperkeks]

Reported by MinGW/GCC 10

I agree that my contributions are licensed under the {fmt} license, and agree to future changes to the licensing.

[vitaut]

Thanks for the PR.

It's better to suppress the warning in the same way it is done for printf

fmt/include/fmt/format-inl.h

Line 2529 in e737672

int (*snprintf_ptr)(char*, size_t, const char*, ...) = FMT_SNPRINTF;

instead of using compiler-specific #pragma warning.

[HazardyKnusperkeks]

Updated.

And for the record, the internal compiler error (which forbids auto) seems to be still in place with GCC/MinGW 10.2.

[vitaut]

Thanks