VideoToolbox macOS xcode13.0 beta2

#VideoToolbox.framework https://github.com/xamarin/xamarin-macios/pull/12466

diff -ruN /Applications/Xcode_13.0.0-beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/VideoToolbox.framework/Headers/VTErrors.h /Applications/Xcode_13.0.0-beta2.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/VideoToolbox.framework/Headers/VTErrors.h
--- /Applications/Xcode_13.0.0-beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/VideoToolbox.framework/Headers/VTErrors.h	2021-05-29 21:49:55.000000000 -0400
+++ /Applications/Xcode_13.0.0-beta2.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/VideoToolbox.framework/Headers/VTErrors.h	2021-06-13 21:39:34.000000000 -0400
@@ -61,6 +61,7 @@
 	kVTVideoDecoderNeedsRosettaErr			= -17692,
 	kVTVideoEncoderNeedsRosettaErr			= -17693,
 	kVTVideoDecoderReferenceMissingErr		= -17694,
+	kVTVideoDecoderCallbackMessagingErr		= -17695,
 };
 
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