Fix the compiler error with the JCL min jar source (eclipse-jdt#4897)

Author: jarthana

JCL/jclMin17/src/java/util/ArrayList.java

@@ -1,6 +1,8 @@
 package java.util;
 
 public class ArrayList<T> implements List<T>, java.io.Serializable {
+	private static final long serialVersionUID = 1L;
+
 	public ArrayList(int initialCapacity) {
 	}
 
@@ -28,5 +30,5 @@ public boolean addAll(Collection<? extends T> c) {
 
 	public T[] toArray(T[] a) {
 		return a;
-	}
+	} 
 }

JCL/jclMin17/src/java/util/Collection.java

@@ -4,6 +4,6 @@ public interface Collection<T> extends Iterable<T> {
 	public Iterator<T> iterator();
 	public int size();
 	public T get(int index);
-	public boolean addAll(Collection<T> c);
+	public boolean addAll(Collection<? extends T> c);
 	public T[] toArray(T[] o);
 }