Author: Eloy Lafuente (stronk7)
MDL-66262 env: Moodle 3.6.x and 3.7.x do not support PHP 7.4
http://git.moodle.org/gw?p=moodle.git;a=commit;h=c2617a2878250599d8bc398d63e4a99e0dc109f6
http://github.com/moodle/moodle/commit/c2617a2878250599d8bc398d63e4a99e0dc109f6
+ 3.8 en [unsupportedphpversion74,core_admin]