AudioToolbox iOS xcode13.0 beta4

#AudioToolbox.framework https://github.com/xamarin/xamarin-macios/pull/12491

diff -ruN /Applications/Xcode_13.0.0-beta3.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/System/Library/Frameworks/AudioToolbox.framework/Headers/AUAudioUnit.h /Applications/Xcode_13.0.0-beta4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/System/Library/Frameworks/AudioToolbox.framework/Headers/AUAudioUnit.h
--- /Applications/Xcode_13.0.0-beta3.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/System/Library/Frameworks/AudioToolbox.framework/Headers/AUAudioUnit.h	2021-07-13 00:39:39.000000000 -0400
+++ /Applications/Xcode_13.0.0-beta4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/System/Library/Frameworks/AudioToolbox.framework/Headers/AUAudioUnit.h	2021-07-22 14:30:54.000000000 -0400
@@ -246,7 +246,7 @@
 	@param enabled
 		YES if the profile was enabled, NO if the profile was disabled.
 */
-typedef void (^AUMIDICIProfileChangedBlock)(uint8_t cable, MIDIChannelNumber channel, MIDICIProfile *profile, BOOL enabled);
+typedef void (^AUMIDICIProfileChangedBlock)(uint8_t cable, MIDIChannelNumber channel, MIDICIProfile *profile, BOOL enabled) API_AVAILABLE(macos(10.14), ios(12.0)) __WATCHOS_PROHIBITED __TVOS_PROHIBITED;
 
 /*!	@enum		AUHostTransportStateFlags
 	@brief		Flags describing the host's transport state.