[coretelephony] Update for Xcode 10.1 beta 2 (#4993)

Filed radar https://trello.com/c/WKIRTcLk for probably incorrect macOS API.

src/coretelephony.cs

@@ -147,11 +147,34 @@ namespace CoreTelephony {
 		string CarrierName { get; }
 	}
 
+	interface ICTSubscriberDelegate {}
+
+	[Protocol]
+	[iOS (12,1)]
+	interface CTSubscriberDelegate {
+		[Abstract]
+		[Export ("subscriberTokenRefreshed:")]
+		void SubscriberTokenRefreshed (CTSubscriber subscriber);
+	}
+
 	[BaseType (typeof (NSObject))]
 	[iOS (7,0)]
 	partial interface CTSubscriber {
 		[iOS (7,0), Export ("carrierToken")]
 		NSData CarrierToken { get; }
+
+		[iOS (12,1)]
+		[Export ("identifier")]
+		string Identifier { get; }
+
+		[iOS (12,1)]
+		[NullAllowed, Export ("delegate", ArgumentSemantic.Weak)]
+		NSObject WeakDelegate { get; set; }
+
+		[iOS (12,1)]
+		[Wrap ("WeakDelegate")]
+		[NullAllowed]
+		ICTSubscriberDelegate Delegate { get; set; }
 	}
 
 #if !XAMCORE_2_0
@@ -160,9 +183,15 @@ namespace CoreTelephony {
 
 	[iOS (6,0), BaseType (typeof (NSObject))]
 	partial interface CTSubscriberInfo {
+		[Deprecated (PlatformName.iOS, 12, 1, message : "Use 'Subscribers' instead.")]
 		[Static]
 		[Export ("subscriber")]
 		CTSubscriber Subscriber { get; }
+
+		[iOS (12,1)]
+		[Static]
+		[Export ("subscribers")]
+		CTSubscriber[] Subscribers { get; }
 	}
 
 	[iOS (12,0)]

tests/xtro-sharpie/iOS-CoreTelephony.todo

@@ -1,5 +0,0 @@
-!missing-protocol! CTSubscriberDelegate not bound
-!missing-selector! +CTSubscriberInfo::subscribers not bound
-!missing-selector! CTSubscriber::delegate not bound
-!missing-selector! CTSubscriber::identifier not bound
-!missing-selector! CTSubscriber::setDelegate: not bound

tests/xtro-sharpie/macOS-CoreTelephony.ignore

@@ -0,0 +1,2 @@
+# Probably a mistake by Apple, see radar -> https://trello.com/c/WKIRTcLk
+!missing-protocol! CTSubscriberDelegate not bound

tests/xtro-sharpie/macOS-CoreTelephony.todo

@@ -1 +0,0 @@
-!missing-protocol! CTSubscriberDelegate not bound