Git commits in Moodle 3.7.6 by fujiwara

commit a22a46a68949f3109a5949205d4aa25ae4c4aac1
Author: fujiwara <shintaro.fujiwara@gmail.com>
Date:   Mon, 04 May 2020 20:43:57 +0800
Tag:    v3.7.6

MDL-68415 email: Fix attachment in email_to_user()