[introspection] Update according to changes that seem to have occurred in macOS 10.15.2. (#7567)

tests/introspection/Mac/MacApiCtorInitTest.cs

@@ -206,6 +206,9 @@ namespace Introspection {
 				due to a privacy violation (even if the required entry is present in the Info.plist).
 		     */
 				return true;
+			case "AVFoundation.AVAudioRecorder": // Stopped working in macOS 10.15.2
+				return TestRuntime.CheckXcodeVersion (11, 2);
+
 			}
 
 			switch (type.Namespace) {

tests/introspection/Mac/MacApiProtocolTest.cs

@@ -86,6 +86,10 @@ namespace Introspection {
 				case "NSFileProviderDomain": // Conformance not in headers
 				case "FPUIActionExtensionContext": // Conformance not in headers
 					return true;
+				// macOS 10.15.2
+				case "NSPrintInfo": // Conformance not in headers
+				case "NSPrinter": // Conformance not in headers
+					return true;
 #if !UNIFIED
 				// existing classic/old binary is not updated
 				case "NSAppearance":