Introspection (iOS, tvOS) failures on older OS versions

[rolfbjarne]

There are a few new introspection failures on iOS 12.4 and tvOS 12.4:

iOS:

[FAIL] Selector not found for NetworkExtension.NEAppProxyFlow : networkInterface in IntPtr get_WeakNetworkInterface() on NetworkExtension.NEAppProxyFlow 
[FAIL] Selector not found for NetworkExtension.NEAppProxyFlow : setNetworkInterface: in Void set_WeakNetworkInterface(IntPtr) on NetworkExtension.NEAppProxyFlow 
[FAIL] Selector not found for WebKit.WKPreferences : setTextInteractionEnabled: in Void set__OldTextInteractionEnabled(Boolean) on WebKit.WKPreferences 
[FAIL] Selector not found for CoreMidi.MidiCISession : midiDestination in Int32 get__MidiDestination() on CoreMidi.MidiCISession 
[FAIL] Selector not found for CoreBluetooth.CBManager : authorization in CoreBluetooth.CBManagerAuthorization get__IAuthorization() on CoreBluetooth.CBManager 
[FAIL] Selector not found for UIKit.NSTextAttachment : attachmentBoundsForAttributes:location:textContainer:proposedLineFragment:position: in CoreGraphics.CGRect GetAttachmentBounds(Foundation.NSDictionary`2[Foundation.NSString,Foundation.NSObject], UIKit.INSTextLocation, UIKit.NSTextContainer, CoreGraphics.CGRect, CoreGraphics.CGPoint) on UIKit.NSTextAttachment 
[FAIL] Selector not found for UIKit.NSTextAttachment : imageForBounds:attributes:location:textContainer: in UIKit.UIImage GetImageForBounds(CoreGraphics.CGRect, Foundation.NSDictionary`2[Foundation.NSString,Foundation.NSObject], UIKit.INSTextLocation, UIKit.NSTextContainer) on UIKit.NSTextAttachment 
[FAIL] Selector not found for UIKit.NSTextAttachment : viewProviderForParentView:location:textContainer: in UIKit.NSTextAttachmentViewProvider GetViewProvider(UIKit.UIView, UIKit.INSTextLocation, UIKit.NSTextContainer) on UIKit.NSTextAttachment 
[FAIL] InstanceMethods : 8 errors found in 21287 instance selector validated: 
[FAIL] CoreBluetooth.CBManager : authorization 
[FAIL] StaticMethods : 1 errors found in 2523 static selector validated: 

tvOS:

[FAIL] Selector not found for UIKit.NSTextAttachment : attachmentBoundsForAttributes:location:textContainer:proposedLineFragment:position: in CoreGraphics.CGRect GetAttachmentBounds(Foundation.NSDictionary`2[Foundation.NSString,Foundation.NSObject], UIKit.INSTextLocation, UIKit.NSTextContainer, CoreGraphics.CGRect, CoreGraphics.CGPoint) on UIKit.NSTextAttachment 
[FAIL] Selector not found for UIKit.NSTextAttachment : imageForBounds:attributes:location:textContainer: in UIKit.UIImage GetImageForBounds(CoreGraphics.CGRect, Foundation.NSDictionary`2[Foundation.NSString,Foundation.NSObject], UIKit.INSTextLocation, UIKit.NSTextContainer) on UIKit.NSTextAttachment 
[FAIL] Selector not found for UIKit.NSTextAttachment : viewProviderForParentView:loca

Ref: #14889 (comment)

This seems to have started with 1dcefc9 (CC @chamons)