Git commits in Moodle 3.7.x by Tomasz Muras

commit c126a29f5af9043d784740ba27b324f96c7731ca
Author: Tomasz Muras <tm@enovation.ie>
Date:   Tue, 17 Jul 2018 21:37:15 +0800
Tag:    v3.7.0-beta

MDL-52966 core: static cache fix for file types.