fix xompile errors

Author: zbynek

user/test/com/google/gwt/emultest/Java12EmulSuite.java

@@ -25,5 +25,5 @@
 @Suite.SuiteClasses({
     StringTest.class,
 })
-public class EmulJava11Suite {
+public class EmulJava12Suite {
 }

user/test/com/google/gwt/emultest/java12/lang/StringTest.java

@@ -13,7 +13,7 @@
  * License for the specific language governing permissions and limitations under
  * the License.
  */
-package com.google.gwt.emultest.java11.lang;
+package com.google.gwt.emultest.java12.lang;
 
 import com.google.gwt.dev.util.arg.SourceLevel;
 import com.google.gwt.emultest.java.util.EmulTestBase;