Fix compilation error with gcc-7.2.0 - #3066
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Without the added line, the gcc-7.2.0 compiler will give the following error:
```
/opt/compiler-explorer/libs/fmt/trunk/include/fmt/format.h:1240:8: error: uninitialized variable 'buffer' in 'constexpr' function
Char buffer[digits10<UInt>() + 1];
^~~~~~
```
See https://godbolt.org/z/fh7TMs9qs
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This was referenced Mar 12, 2023
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Without the added line, the gcc-7.2.0 compiler will give the following error:
See https://godbolt.org/z/fh7TMs9qs