disable self-argument extraction for lambda functions to revert to old "self...

disable self-argument extraction for lambda functions to revert to old "self in args" argument parsing behaviour

Cython/Compiler/ExprNodes.py

@@ -8903,7 +8903,7 @@ class PyCFunctionNode(ExprNode, ModuleNameMixin):
         elif def_node.is_classmethod:
             flags.append('__Pyx_CYFUNCTION_CLASSMETHOD')
 
-        if def_node.local_scope.parent_scope.is_c_class_scope:
+        if def_node.local_scope.parent_scope.is_c_class_scope and not def_node.entry.is_anonymous:
             flags.append('__Pyx_CYFUNCTION_CCLASS')
 
         if flags: