Add info to external pointer free callback. (#4642)

Furthermore reduce memory consumption when only
one external pointer is assigned to an object.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com

tests/unit-ext/test-ext-handle-scope-escape.c

@@ -24,10 +24,12 @@
 static int native_free_cb_call_count;
 
 static void
-native_free_cb (void *native_p)
+native_free_cb (void *native_p, /**< native pointer */
+                jerry_object_native_info_t *info_p) /**< native info */
 {
-  ++native_free_cb_call_count;
   (void) native_p;
+  (void) info_p;
+  ++native_free_cb_call_count;
 } /* native_free_cb */
 
 static const jerry_object_native_info_t native_info =