Add a pedantic C compile test for c2x in addition to the existing ones for c90, c99, and c11. Add a pedantic C++ compile test for c++20 in addition to the existing ones for c++98, c++11, c++14, and c++17.
Add a pedantic C compile test for c2x in addition to the existing ones for c90, c99, and c11. Add a pedantic C++ compile test for c++20 in addition to the existing ones for c++98, c++11, c++14, and c++17.