Author: Ryan Wyllie
MDL-50624 environment: add PHP7 as unsupported version
Added PHP7 as an unsupported version for Moodle 2.8 and 2.9 in
the environment checks
http://git.moodle.org/gw?p=moodle.git;a=commit;h=713927f91509c28aa8f8d2a8b5290fe4d4c6637e
http://github.com/moodle/moodle/commit/713927f91509c28aa8f8d2a8b5290fe4d4c6637e
+ 2.8 en [unsupportedphpversion7,core_admin]