When detecting function delegation at the last statement position we
need to make sure that delegating call has unit return type, otherwise
we would try to return non-Unit value from a parent function returning
Unit
^KT-60700 Fixed
We are going to deprecate `WITH_RUNTIME` directive. The main reason
behind this change is that `WITH_STDLIB` directive better describes
its meaning, specifically it will add kotlin stdlib to test's classpath.