C++ test failures
This is reproducible by running tests in the recently updated docker image `archlinux:py2many`

```
Writing to: /home/build/py2many/tests/build
/home/build/py2many/tests/build/comb_sort.cpp:4:10: fatal error: 'cppitertools/range.hpp' file not found
    4 | #include <cppitertools/range.hpp>  // NOLINT(build/include_order)
      |          ^~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
```