cleanup: remove redundant superinterfaces

h2/src/main/org/h2/jdbc/JdbcClob.java

@@ -29,8 +29,7 @@ import org.h2.value.Value;
 /**
  * Represents a CLOB value.
  */
-public class JdbcClob extends TraceObject implements Clob
-    , NClob
+public class JdbcClob extends TraceObject implements NClob
 {
 
     Value value;

h2/src/tools/org/h2/dev/cache/CacheLIRS.java

@@ -43,7 +43,7 @@ import java.util.Set;
  * @param <K> the key type
  * @param <V> the value type
  */
-public class CacheLIRS<K, V> extends AbstractMap<K, V> implements Map<K, V> {
+public class CacheLIRS<K, V> extends AbstractMap<K, V> {
 
     /**
      * The maximum memory this cache should use.