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.
This change is to fill the gap between Kotlin Collection
classes(immutable) and Java Collection classes(mutable), to avoid
calling an unsupported operation like remove() on an immutable class in
jvm.
Ivan Kylchik