Do ourselves and our users a favor by pointing out why Qt (Quick)
apps perform horribly on commonly used distros on the RPi. Using
a software rasterizer on such boards is not going to cut it.

Task-number: QTBUG-50533
Change-Id: I087f502ddb9c6bdde84343e6abd85c87cdc474f0
Reviewed-by: Andy Nichols <andy.nichols@theqtcompany.com>