Author: Adrian Greeve
MDL-48228 database: Make utf8mb4 the default character set for mysql.
Thanks to Jetha Chan for providing the initial patch that this is
based on.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=39e019735f312aadf0030ca1ae4fcc3980c3c661
http://github.com/moodle/moodle/commit/39e019735f312aadf0030ca1ae4fcc3980c3c661
+ 3.1 en [incompleteunicodesupport,core_admin]
+ 3.1 en [unsupporteddbfileformat,core_admin]
+ 3.1 en [unsupporteddbfilepertable,core_admin]
+ 3.1 en [unsupporteddblargeprefix,core_admin]