make things compile on Java5 again

src/tests/junit/org/apache/tools/ant/taskdefs/optional/junit/JUnitTestRunnerTest.java

@@ -254,7 +254,9 @@ public class JUnitTestRunnerTest {
     public static class AssertionErrorTest {
         @Test
         public void throwsAssertionError() {
-            throw new AssertionError("failure message", new RuntimeException("cause message"));
+            AssertionError assertionError = new AssertionError("failure message");
+            assertionError.initCause(new RuntimeException("cause message"));
+            throw assertionError;
         }
     }
 }

src/tests/junit/org/apache/tools/ant/types/selectors/ModifiedSelectorTest.java

@@ -42,6 +42,7 @@ import org.apache.tools.ant.types.selectors.modifiedselector.HashvalueAlgorithm;
 import org.apache.tools.ant.types.selectors.modifiedselector.ModifiedSelector;
 import org.apache.tools.ant.types.selectors.modifiedselector.PropertiesfileCache;
 import org.apache.tools.ant.util.FileUtils;
+import org.apache.tools.ant.util.StringUtils;
 import org.junit.Assume;
 import org.junit.Before;
 import org.junit.Ignore;
@@ -947,7 +948,7 @@ public class ModifiedSelectorTest {
             try {
                 FileWriter out = new FileWriter(file.getAbsolutePath(), true);
                 out.write(line);
-                out.write(System.lineSeparator());
+                out.write(StringUtils.LINE_SEP);
                 out.flush();
                 out.close();
             } catch (Exception e) {