Suppress acceptable raw type warning

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/collections/trunk@1300077 13f79535-47bb-0310-9956-ffa450edef68

src/main/java/org/apache/commons/collections/CollectionUtils.java

@@ -128,6 +128,7 @@ public class CollectionUtils {
      * this purpose. However they could be cast to Set or List which might be
      * undesirable. This implementation only implements Collection.
      */
+    @SuppressWarnings("rawtypes") // we deliberately use the raw type here
     public static final Collection EMPTY_COLLECTION = UnmodifiableCollection.unmodifiableCollection(new ArrayList<Object>());
 
     /**