[introspection] Do not let intro check on QTKit now that is just stubs

tests/apitest/src/DelegateAndDataSourceTest.cs

@@ -123,16 +123,14 @@ bool Skip (Type t)
 				if (IntPtr.Size == 4 && PlatformHelper.CheckSystemVersion(10, 13)) // Removed from 32-bit in macOS 10.13
 					return true;
 				break;
-			case "QTMovie":
-				return TestRuntime.CheckSystemVersion (PlatformName.MacOSX, 10, 14, 4); // Broke in macOS 10.14.4.
 			case "AVCaptureView":
 				// Deallocating a AVCaptureView makes it trigger a permission dialog, which we don't want, so just skip this type.
 				return true;
 			}
 
 			switch (t.Namespace) {
 			case "QTKit":
-				return TestRuntime.CheckSystemVersion (PlatformName.MacOSX, 10, 15); // QTKit is gone in 10.15.
+				return true; // QTKit has been removed from macos.
 			}
 
 			return false;

tests/introspection/ApiCtorInitTest.cs

@@ -118,16 +118,18 @@ protected virtual bool Skip (Type type)
 			case "CKSubscription":
 			case "MPSCnnConvolutionState":
 				return true;
-			case "QTMovie":
-				return TestRuntime.CheckSystemVersion (PlatformName.MacOSX, 10, 14, 4); // Broke in macOS 10.14.4.
 			}
 
-#if __IOS__
 			switch (type.Namespace) {
+#if __IOS__
 			case "WatchKit":
 				return true; // WatchKit has been removed from iOS.
-			}
+#elif MONOMAC
+			case "QTKit":
+				return true; // QTKit has been removed from macos.
 #endif
+			}
+
 			// skip types that we renamed / rewrite since they won't behave correctly (by design)
 			if (SkipDueToRejectedTypes (type))
 				return true;

tests/introspection/Mac/MacApiFieldTest.cs

@@ -52,6 +52,9 @@ protected override bool Skip (Type type)
 				if (!Mac.CheckSystemVersion (10, 12) || IntPtr.Size != 8)
 					return true;
 				break;
+			case "MonoMac.QTKit": // QTKit has been removed from macOS
+			case "QTKit":
+				return true;
 			}
 			return false;
 		}

tests/introspection/Mac/MacApiWeakPropertyTest.cs

@@ -20,6 +20,13 @@ protected override bool Skip (Type type)
 			case "VNImageOptions":
 				return true; 
 			}
+
+			switch (type.Namespace) {
+			case "MonoMac.QTKit": // QTKit has been removed from macOS
+			case "QTKit":
+				return true;
+			}
+
 			return base.Skip (type);
 		}
 	}