UIKit tvOS xcode13.3 beta2

#UIKit.framework https://github.com/xamarin/xamarin-macios/pull/14325

diff -ruN /Applications/Xcode_13.3.0-beta.app/Contents/Developer/Platforms/AppleTVOS.platform/Developer/SDKs/AppleTVOS.sdk/System/Library/Frameworks/UIKit.framework/Headers/ShareSheetDefines.h /Applications/Xcode_13.3.0-beta2.app/Contents/Developer/Platforms/AppleTVOS.platform/Developer/SDKs/AppleTVOS.sdk/System/Library/Frameworks/UIKit.framework/Headers/ShareSheetDefines.h
--- /Applications/Xcode_13.3.0-beta.app/Contents/Developer/Platforms/AppleTVOS.platform/Developer/SDKs/AppleTVOS.sdk/System/Library/Frameworks/UIKit.framework/Headers/ShareSheetDefines.h	1969-12-31 19:00:00.000000000 -0500
+++ /Applications/Xcode_13.3.0-beta2.app/Contents/Developer/Platforms/AppleTVOS.platform/Developer/SDKs/AppleTVOS.sdk/System/Library/Frameworks/UIKit.framework/Headers/ShareSheetDefines.h	2022-01-30 15:54:26.000000000 -0500
@@ -0,0 +1,18 @@
+#if (defined(USE_UIKIT_PUBLIC_HEADERS) && USE_UIKIT_PUBLIC_HEADERS) || !__has_include(<ShareSheet/ShareSheetDefines.h>)
+//
+//  ShareSheetDefines.h
+//  ShareSheet
+//
+//  Created by Jacob Klapper on 2/19/18.
+//  Copyright © 2018 Apple Inc. All rights reserved.
+//
+
+#ifdef __cplusplus
+#define SHARESHEET_EXTERN    extern "C" __attribute__((visibility ("default")))
+#else
+#define SHARESHEET_EXTERN    extern __attribute__((visibility ("default")))
+#endif
+
+#else
+#import <ShareSheet/ShareSheetDefines.h>
+#endif