Autotest/catch2 support for __has_include

To support either system wide or bundled catch dep I use this code fragment:

#if __has_include(<catch2/catch.hpp>)
#include <catch2/catch.hpp>
#else
#include <catch.hpp>
#endif

Moving #include <catch2/catch.hpp> outside of __has_include works immediately. 

It seems that autotest plugin doesn't support this. I don't know if this could be easily fixed with current code parser, is it just that C++17 isn't enabled? 

I get this issue with both CMake and Meson plugin as project managers.