VideoToolbox macOS xcode13.0 beta3

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

diff -ruN /Applications/Xcode_13.0.0-beta2.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/VideoToolbox.framework/Headers/VTVideoEncoderList.h /Applications/Xcode_13.0.0-beta3.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/VideoToolbox.framework/Headers/VTVideoEncoderList.h
--- /Applications/Xcode_13.0.0-beta2.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/VideoToolbox.framework/Headers/VTVideoEncoderList.h	2021-06-17 14:32:50.000000000 -0400
+++ /Applications/Xcode_13.0.0-beta3.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/VideoToolbox.framework/Headers/VTVideoEncoderList.h	2021-07-13 00:33:32.000000000 -0400
@@ -32,6 +32,8 @@
 	CM_RETURNS_RETAINED_PARAMETER CM_NULLABLE CFArrayRef * CM_NONNULL listOfVideoEncodersOut ) API_AVAILABLE(macosx(10.8), ios(8.0), tvos(10.2));
 	
 CM_ASSUME_NONNULL_BEGIN
+// keys for options dictionary:
+VT_EXPORT const CFStringRef kVTVideoEncoderListOption_IncludeStandardDefinitionDVEncoders API_AVAILABLE(macosx(12.0), ios(15.0), tvos(15.0)); // optional. CFBoolean.  By default, DV encoders will not be included in the list.  If present and set to kCFBooleanTrue, DV encoders will be included.
 
 // returns CFArray of CFDictionaries with following keys:
 VT_EXPORT const CFStringRef kVTVideoEncoderList_CodecType API_AVAILABLE(macosx(10.8), ios(8.0), tvos(10.2)); // CFNumber for four-char-code (eg, 'avc1')