Author: Petr Škoda
MDL-39985 add explicit MariaDB support
http://git.moodle.org/gw?p=moodle.git;a=commit;h=17601a7e12f05ed67336b41f9a1982e374174435
http://github.com/moodle/moodle/commit/17601a7e12f05ed67336b41f9a1982e374174435
+ 2.6 en [nativemariadb,core_install]
+ 2.6 en [nativemariadbhelp,core_install]