Kapt: Analyze sources again if the received analysis result is 'RetryWithAdditionalJavaRoots'. ->

Add additional Java roots to Java source roots and clear diagnostic messages before the next analysis round.
(cherry picked from commit 17ad807)

compiler/tests/org/jetbrains/kotlin/modules/xml/AbstractModuleXmlParserTest.java

@@ -44,6 +44,11 @@ public abstract class AbstractModuleXmlParserTest extends TestCase {
                 throw new AssertionError(MessageRenderer.PLAIN_FULL_PATHS.render(severity, message, location));
             }
 
+            @Override
+            public void clear() {
+                // Do nothing
+            }
+
             @Override
             public boolean hasErrors() {
                 throw new UnsupportedOperationException();