Use proper version check.

Author: andreiz

php_memcached.c

@@ -2457,7 +2457,7 @@ zend_object_value php_memc_new(zend_class_entry *ce TSRMLS_DC)
 
 	i_obj = ecalloc(1, sizeof(*i_obj));
 	zend_object_std_init( &i_obj->zo, ce TSRMLS_CC );
-#ifdef ZEND_ENGINE_2_4
+#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 *));