Fix #12131: No warning for missing override specifier for virtual function with different default argument

[olabetskyi]

added check for the end off both functions parameter lists during compare

[danmar]

looks good to me. As you change Function::argsMatch, I suggest that you run test-my-pr.py to ensure that it works:

cd cppcheck
git checkout ticket_12131
make clean
python3 tools/test-my-pr.py

Leave the script running for half a day or so.

I think the results is saved in ~/cppcheck-test-my-pr-workfolder/my_check_diff.log and those would be interesting to see.

This could affect many checkers so you might see various warnings.