Make JDK classpath roots configuration explicit...

instead of relying on the "configuration files" parameter.
(in the process of migration from KotlinCoreEnvironment).

compiler/tests-common/tests/org/jetbrains/kotlin/test/KotlinTestUtils.java

@@ -60,7 +60,6 @@ import java.lang.annotation.Annotation;
 import java.lang.reflect.Method;
 import java.nio.file.Path;
 import java.util.*;
-import java.util.function.Function;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -212,6 +211,7 @@ public class KotlinTestUtils {
         }
 
         JvmContentRootsKt.addJvmClasspathRoots(configuration, classpath);
+        JvmContentRootsKt.configureJdkClasspathRoots(configuration);
 
         return configuration;
     }