[tests] Fix MoviePlayerControllerTest for it's classic only test (broke on iOS 10 beta 3) (#443)

tests/monotouch-test/MediaPlayer/MoviePlayerControllerTest.cs

@@ -36,6 +36,10 @@ namespace MonoTouchFixtures.MediaPlayer {
 			if (!UIDevice.CurrentDevice.CheckSystemVersion (7,0))
 				Assert.Inconclusive ("Requires 7.0+");
 
+			// NSInvalidArgumentException +[MPMoviePlayerController preparePrerollAds]: unrecognized selector sent to class 0x109c46b48
+			if (UIDevice.CurrentDevice.CheckSystemVersion (10, 0))
+				Assert.Ignore ("Broken on iOS 10 beta 3");
+
 			MPMoviePlayerController mpc = null;
 			mpc.PreparePrerollAds ();
 		}