Git commits in Moodle 3.7.4 by David Monllaó

commit 2adc0dbe96d10ee9e581b0acd2d2efd91eaa9a80
Author: David Monllaó <davidm@moodle.com>
Date:   Tue, 12 Nov 2019 08:28:14 +0800
Tag:    v3.7.4

MDL-67217 unittest: usleep and windows don't get along well