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=bd3ce90c13e1029864a6011dd8dd4aa4aabb69d5
http://github.com/moodle/moodle/commit/bd3ce90c13e1029864a6011dd8dd4aa4aabb69d5
+ 3.7 en [unsupportedphpversion74,core_admin]