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=1ed4e401f18081ded824f73cde2c1de030e69ab1
http://github.com/moodle/moodle/commit/1ed4e401f18081ded824f73cde2c1de030e69ab1
+ 3.6 en [unsupportedphpversion74,core_admin]