IOS7: Adjust the frame on safeAreaInsetsDidChange calls

There is a race condition when iOS updates the safe insets and
the view is updated on orientation changes. When rotating the
device the callback function interfaceOrientationChanged is
called. This triggers rebuildSurface to be called, which will
call updateOutputSurface, which will trigger initSurface. That
function will finally will adjust the main frame towards the
safe areas by calling the function adjustViewFrameForSafeArea.

But it seems that when adjustViewFrameForSafeArea is called the
safe insets values are not updated which will lead to wrong
offset values in the frame for touches which will make the mouse
pointer inaccurate.

The iOS system makes calls to safeAreaInsetsDidChange whenever
the safe insets values are updated. Make sure to update the frame
on these calls to get correct touch offsets.

backends/platform/ios7/ios7_video.mm

@@ -820,6 +820,13 @@ uint getSizeNextPOT(uint size) {
 #endif
 }
 
+#ifdef __IPHONE_11_0
+// This delegate method is called when the safe area of the view changes
+-(void)safeAreaInsetsDidChange {
+	[self adjustViewFrameForSafeArea];
+}
+#endif
+
 - (void)setViewTransformation {
 	// Scale the shake offset according to the overlay size. We need this to
 	// adjust the overlay mouse click coordinates when an offset is set.