patch 9.0.1123: class function not implemented yet

Problem:    Class function not implemented yet.
Solution:   Implement defining and calling a class function.
diff --git a/src/structs.h b/src/structs.h
index 45c8211..3bc9278 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -1493,9 +1493,9 @@
     ocmember_T	*class_class_members;	// allocated
     typval_T	*class_members_tv;	// allocated array of class member vals
 
-    // class methods: "static def SomeMethod()"
-    int		class_class_method_count;
-    ufunc_T	**class_class_methods;	// allocated
+    // class functions: "static def SomeMethod()"
+    int		class_class_function_count;
+    ufunc_T	**class_class_functions;	// allocated
 
     // object members: "this.varname"
     int		class_obj_member_count;