[msbuild] Force-Init AppleSdkSettings in DetectSdkLocationsTaskBase (#2781)

Fixes https://bugzilla.xamarin.com/show_bug.cgi?id=59756

external/Xamarin.MacDev

@@ -1 +1 @@
-Subproject commit 59023905966b465cc92bb46535cf66a59a38d39f
+Subproject commit dc219b2379b6b4470625d284dfe664b418ca1977

msbuild/Xamarin.iOS.Tasks.Core/Tasks/DetectSdkLocationsTaskBase.cs

@@ -88,7 +88,7 @@ namespace Xamarin.iOS.Tasks
 
 		public override bool Execute ()
 		{
-			AppleSdkSettings.CheckChanged ();
+			AppleSdkSettings.Init ();
 			IPhoneSdks.Reload ();
 
 			TargetArchitecture architectures;