vector: add a macro to forward a vector-ref to another function

mie/include/mie/vector.h

@@ -40,7 +40,7 @@ struct mie_vector_ops {
 /* use this macro to forward your reference to a vector (which you got via
  * MIE_VECTOR_REF_PARAM in your function prototype), to another function whose
  * prototype also uses MIE_VECTOR_REF_PARAM */
-#define MIE_VECTOR_REF2(name) &(name.items), &(name.count), &(name.max)
+#define MIE_VECTOR_REF2(name) name, name##_count, name##_max
 
 /* use these functions if you're accessing a vector directly. */
 #define mie_vector_push_back(vector, ptr, ops)                                 \