#7137 iOS-rotation doesn't catch up when switching apps.

[Einar Johan T.S.]

Simply put, if you are in portrait mode, then switch out of the app to some other app, and rotate
your screen to landscape, and then go back, the game image will be stretched in the wrong way (i.e. the
aspect will be reversed). Flipping the phone back and forth between landscape/portrait again while in app
will correct the aspect.

This was all tested on an iPhone 6S, using a build I made myself of a quite recent git-checkout (built the various dependency libraries myself to see how that is done).