Revert final on System classpath

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@275009 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/types/Path.java

@@ -100,7 +100,7 @@ public class Path extends DataType implements Cloneable {
     private Vector elements;
 
     /** The system classspath as a Path object */
-    public static final Path systemClasspath =
+    public static Path systemClasspath =
         new Path(null, System.getProperty("java.class.path"));