Author: Matteo Scaramuccia
MDL-51080 env: warn when running MariaDB w/ wrong dbtype
http://git.moodle.org/gw?p=moodle.git;a=commit;h=09ca9728773bf039bf40e9353d17a01727eb5a5b
http://github.com/moodle/moodle/commit/09ca9728773bf039bf40e9353d17a01727eb5a5b
+ 3.6 en [environmentmariadbwrongdbtype,core_admin]