fix warning in generated code

Author: timfel

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/BuiltinConstructors.java

@@ -1809,7 +1809,7 @@ Object method(PythonClass cls, Object self, PFunction func) {
         }
 
         @Specialization(guards = "isPythonBuiltinClass(cls)")
-        Object method(@SuppressWarnings("unused") PythonClass cls, Object self, PBuiltinFunction func) {
+        Object builtinMethod(@SuppressWarnings("unused") PythonClass cls, Object self, PBuiltinFunction func) {
             return factory().createBuiltinMethod(self, func);
         }
     }