add "final" to PythonToNativeNewRefNode, etc.

Author: lukasstadler

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/cext/capi/transitions/CApiTransitions.java

@@ -737,7 +737,7 @@ public static Object executeUncached(Object obj) {
         }
 
         @Override
-        protected boolean needsTransfer() {
+        protected final boolean needsTransfer() {
             return true;
         }
     }
@@ -891,7 +891,7 @@ public static Object executeUncached(Object obj) {
         }
 
         @Override
-        protected boolean needsTransfer() {
+        protected final boolean needsTransfer() {
             return true;
         }
     }