patch 9.0.1838: Vim9: Cannot modify class member vars from def function

Problem:  Vim9: Cannot modify class member vars from def function
Solution: Add support for modifying class member variables from a def
          function

closes: #12995

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Yegappan Lakshmanan <yegappan@yahoo.com>
diff --git a/src/proto/vim9class.pro b/src/proto/vim9class.pro
index 47bfa9d..5fa0ab2 100644
--- a/src/proto/vim9class.pro
+++ b/src/proto/vim9class.pro
@@ -1,7 +1,7 @@
 /* vim9class.c */
 int object_index_from_itf_index(class_T *itf, int is_method, int idx, class_T *cl);
 void ex_class(exarg_T *eap);
-type_T *class_member_type(class_T *cl, char_u *name, char_u *name_end, int *member_idx, ocmember_T **m);
+type_T *class_member_type(class_T *cl, int is_object, char_u *name, char_u *name_end, int *member_idx, ocmember_T **m);
 void ex_enum(exarg_T *eap);
 void ex_type(exarg_T *eap);
 int class_object_index(char_u **arg, typval_T *rettv, evalarg_T *evalarg, int verbose);