[src] Add back manual NewsstandKitLibrary constant for backwards compatibility. (#18841)

src/Constants.iOS.cs.in

@@ -19,5 +19,10 @@ namespace ObjCRuntime {
 
 		// iOS 9
 		public const string libcompressionLibrary = "/usr/lib/libcompression.dylib";
+
+#if !XAMCORE_5_0
+		// Apple removed the NewsstandKit framework from iOS in Xcode 15.
+		public const string NewsstandKitLibrary = "/System/Library/Frameworks/NewsstandKit.framework/NewsstandKit";
+#endif
 	}
 }

tests/introspection/ApiTypoTest.cs

@@ -1064,6 +1064,10 @@ namespace Introspection {
 				case "SdkVersion":
 					Assert.True (Version.TryParse (s, out _), fi.Name);
 					break;
+#if !XAMCORE_5_0
+				case "NewsstandKitLibrary": // Removed from iOS, but we have to keep the constant around for binary compatibility.
+					break;
+#endif
 #if !NET
 #if __TVOS__
 				case "PassKitLibrary": // not part of tvOS