kotlin runtime must be added to classpath

(not just to library root)

compiler/cli/src/org/jetbrains/jet/cli/jvm/compiler/JetCoreEnvironment.java

@@ -72,9 +72,7 @@ public class JetCoreEnvironment extends JavaCoreEnvironment {
             }
         }
         if (compilerSpecialMode.includeKotlinRuntime()) {
-            for (VirtualFile root : compilerDependencies.getRuntimeRoots()) {
-                addLibraryRoot(root);
-            }
+            addToClasspath(compilerDependencies.getRuntimeJar());
         }
 
         JetStandardLibrary.initialize(getProject());