Convert many object types structs to use C99 tagged initializer syntax.
diff --git a/py/objdict.c b/py/objdict.c
index 3737f5e..b3e21ae 100644
--- a/py/objdict.c
+++ b/py/objdict.c
@@ -63,14 +63,11 @@
 const mp_obj_type_t dict_type = {
     { &mp_const_type },
     "dict",
-    dict_print, // print
-    dict_make_new, // make_new
-    NULL, // call_n
-    NULL, // unary_op
-    dict_binary_op, // binary_op
-    NULL, // getiter
-    NULL, // iternext
-    {{NULL, NULL},}, // method list
+    .print = dict_print,
+    .make_new = dict_make_new,
+    .binary_op = dict_binary_op,
+    .getiter = NULL,
+    .methods = {{NULL, NULL},},
 };
 
 mp_obj_t mp_obj_new_dict(int n_args) {