Git commits in Moodle 3.7.6 by Stephen Vickers

commit 50e3ae359b9872b0932159970699040433e6cea1
Author: Stephen Vickers <stephen@spvsoftwareproducts.com>
Date:   Wed, 26 Feb 2020 05:17:49 +0800
Tag:    v3.7.6

MDL-68049 mod_lti: Fix link-level memberships service