Author: Charles Fulton
MDL-58931 dml: add support for aurora mysql
http://git.moodle.org/gw?p=moodle.git;a=commit;h=66ba391e82ec0154c0f3d93085fe3ec1210fdd33
http://github.com/moodle/moodle/commit/66ba391e82ec0154c0f3d93085fe3ec1210fdd33
+ 4.0 en [nativeauroramysql,core_install]
+ 4.0 en [nativeauroramysqlhelp,core_install]