Fix 5.4.x compile issue

When compile under 5.4, it failed. the code in master not works:

`#if PHP_VERSION_ID >= 50400
	object_properties_init( (zend_object *) i_obj, ce);
#else
    zend_hash_copy(i_obj->zo.properties, &ce->default_properties, (copy_ctor_func_t) zval_add_ref, (void *) &tmp, sizeof(zval *));
#endif
`
So I change to the method below, and it works now:

`#if PHP_VERSION_ID < 50399
    zend_hash_copy(i_obj->zo.properties, &ce->default_properties, (copy_ctor_func_t) zval_add_ref, (void *) &tmp, sizeof(zval *));
#else
	object_properties_init( (zend_object *) i_obj, ce);
#endif
`
here is bug : https://bugs.php.net/bug.php?id=64336