172b031a50
Clang complains about "forward declaration of template entity" of all basic_data<>'s members that do not have definitions in `format.h`
```
C:/Users/User/AppData/Roaming/fmt-master/include\fmt/format.h:956:25: warning: instantiation of variable 'fmt::detail::basic_data<>::powers_of_10_64' required here, but no definition is available [-Wundefined-var-template]
static const uint64_t powers_of_10_64[];
^
C:/Users/User/AppData/Roaming/fmt-master/include\fmt/format.h:956:25: note: forward declaration of template entity is here
C:/Users/User/AppData/Roaming/fmt-master/include\fmt/format.h:956:25: note: add an explicit instantiation declaration to suppress this warning if 'fmt::detail::basic_data<>::powers_of_10_64' is explicitly instantiated in another translation unit
```
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