[clang-tidy] some `modernize-use-auto` warnings unnecessarily limited to C++17

```cpp
#include

void f()
{
std::multimap mm;
auto range = mm.equal_range(0);
for (std::multimap::const_iterator I = range.first; I != range.second; ++I) {}
for (auto I = range.first; I != range.second; ++I) {}
}
```

The first loop is only reported with C++17 although it compiles using `auto` with C++11 (the second loop is the code after applying the fix-it in C++17 mode).

```
:7:10: warning: use auto when declaring iterators [modernize-use-auto]
7 | for (std::multimap::const_iterator I = range.first; I != range.second; ++I) {}
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| auto
```

C++11: https://godbolt.org/z/9TKozqhKb
C++17: https://godbolt.org/z/4541xecsE