Review requests

[Alex Merry]

Review board doesn't appear to be sending emails for my review requests,
so -- since some of them are a dependency of Kevin's repo splitting --
here they are:

Fix KIO superbuild dependencies
https://git.reviewboard.kde.org/r/114127/

Move kmediaplayer to tier3
https://git.reviewboard.kde.org/r/114128/

Move kfileaudiopreview to tier4
https://git.reviewboard.kde.org/r/114129/

Alex


PS: I've logged a ticket with sysadmin, so hopefully the email thing
will get fixed.