Git commits in Moodle 3.8.4 by Adrian Greeve

commit 80c3dcb8bf5de9e0d57ee93b19c037aeaf00355f
Author: Adrian Greeve <abgreeve@gmail.com>
Date:   Thu, 11 Jun 2020 10:48:36 +0800
Tag:    v3.8.4

MDL-66601 atto_image: Remove bad build files.