Git commits in Moodle 3.6.4 by Brendan Heywood

commit 4ad8be5c627f1cb6b7ecd96d1e939e765589a933
Author: Brendan Heywood <brendan@catalyst-au.net>
Date:   Fri, 14 Dec 2018 11:43:02 +0800
Tag:    v3.6.4

MDL-64394 core: Fixed bug when using access log with pre_loginpage_hook