Fixlet + register scan results

Author: grendello

src/Xamarin.Android.Build.Tasks/Tasks/GenerateJavaStubs.cs

@@ -209,9 +209,12 @@ void Run (bool useMarshalMethods)
 					generateSucceeded = false;
 				}
 
-				(success, List<PinvokeScanner.PinvokeEntryInfo> pinfos) = ScanForUsedPinvokes (scanner, arch, state.Resolver);
-				if (!success) {
-					return;
+				if (EnableNativeRuntimeLinking) {
+					(success, List<PinvokeScanner.PinvokeEntryInfo> pinfos) = ScanForUsedPinvokes (scanner, arch, state.Resolver);
+					if (!success) {
+						return;
+					}
+					BuildEngine4.RegisterTaskObjectAssemblyLocal (ProjectSpecificTaskObjectKey (PinvokeScanner.PinvokesInfoRegisterTaskKey), pinfos, RegisteredTaskObjectLifetime.Build);
 				}
 
 				// If this is the first architecture, we need to store the state for later use
@@ -371,10 +374,10 @@ IList<string> MergeManifest (NativeCodeGenState codeGenState, Dictionary<string,
 			return additionalProviders;
 		}
 
-		(bool success, List<PinvokeScanner.PinvokeEntryInfo> pinfos) ScanForUsedPinvokes (PinvokeScanner scanner, AndroidTargetArch arch, XAAssemblyResolver resolver)
+		(bool success, List<PinvokeScanner.PinvokeEntryInfo>? pinfos) ScanForUsedPinvokes (PinvokeScanner scanner, AndroidTargetArch arch, XAAssemblyResolver resolver)
 		{
 			if (!EnableNativeRuntimeLinking) {
-				return;
+				return (true, null);
 			}
 
 			var frameworkAssemblies = new List<ITaskItem> ();

src/Xamarin.Android.Build.Tasks/Utilities/PinvokeScanner.cs

@@ -14,6 +14,8 @@ namespace Xamarin.Android.Tasks;
 
 class PinvokeScanner
 {
+	public const string PinvokesInfoRegisterTaskKey = ".:!PreservePinvokesTaskKey!:.";
+
 	public sealed class PinvokeEntryInfo
 	{
 		public readonly string LibraryName;