fix Class.getDeclaredMethods

Internally, the VM augments the method tables for abstract classes
with any inherited abstract methods to make code simpler elsewhere,
but that means we can't use that table to construct the result of
Class.getDeclaredMethods since it would include methods not actually
declared in the class.  This commit ensures that we preserve and use
the original, un-augmented table for that purpose.

classpath/avian/ClassAddendum.java

@@ -13,4 +13,5 @@ package avian;
 public class ClassAddendum extends Addendum {
   public Object[] interfaceTable;
   public Object[] innerClassTable;
+  public Object[] methodTable;
 }