Ios: Enable plugin for qbs build.

There is no reason why for qbs the plugin should be built on OS X only,
when the qmake build has no such restriction.

Change-Id: I8486ac20b6708c542b2920e946446ba382e0b75c
Reviewed-by: Fawzi Mohamed <fawzi.mohamed@digia.com>
Handle similarity index in git commits

Task-number: QTCREATORBUG-12619
Change-Id: I5af39f18bc02ce1f06bf72f155bf0aaabe8b228d
Reviewed-by: Orgad Shaneh <orgads@gmail.com>