Author: Simey Lameze
MDL-72984 admin: make support email setting mandatory
http://git.moodle.org/gw?p=moodle.git;a=commit;h=eadf1570689a4e598c55cf81ceb26bb407e3873a
http://github.com/moodle/moodle/commit/eadf1570689a4e598c55cf81ceb26bb407e3873a
+ 4.0 en [configsupportemail,core_admin]
+ 4.0 en [contactsitesupport,core_admin]