We need to have at least one other required library (use system for that), otherwise FindBoost will consider itself successful even if it didn't find anything. In that case, _boost_MULTITHREADED
would not be set and we can't find libboost_python.
Also, add Python 3.8 support by using the Python version numbers as library version numbers.
Furthermore, we now correctly use std::filesystem
/std::experimental::filesystem
. There were some modifications late in the C++17 standardization process.