proposal: make plasma *not* build with Qt 5.8.0

[David Edmundson]

Qt 5.8 also fixes multiple bugs, like the infamous one in the delegate
model.
We got more of them than we do of setVisibleRecur or any of the other 5.8
bugs.

Also if Qt 5.8 does introduce new bugs, it's our job to bloody well fix
them.

David
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