Switch to >= Java 1.2 method, a little clearer hopefully.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@277859 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -784,7 +784,7 @@ public abstract class AbstractFileSet extends DataType
                     fs.additionalPatterns
                         .addElement(((PatternSet) e.nextElement()).clone());
                 }
-                fs.selectors = (Vector) fs.selectors.clone();
+                fs.selectors = new Vector(selectors);
                 return fs;
             } catch (CloneNotSupportedException e) {
                 throw new BuildException(e);