fixes

Author: rolfbjarne

msbuild/Xamarin.Shared/Xamarin.Shared.targets

@@ -1149,7 +1149,7 @@ Copyright (C) 2018 Microsoft. All rights reserved.
 	<Target Name="_CoreCompileSceneKitAssets"
 		Inputs="@(SceneKitAsset)"
 		Outputs="$(_SceneKitCache)"
-		DependsOnTargets="_BeforeCoreCompileSceneKitAssets;_GenerateBundleName;_ComputeTargetFrameworkMoniker;_SetResourceMetadata">
+		DependsOnTargets="_BeforeCoreCompileSceneKitAssets;_GenerateBundleName;_ComputeTargetFrameworkMoniker;_SetResourceMetadata;_DetectSdkLocations">
 
 		<CompileSceneKitAssets
 			SessionId="$(BuildSessionId)"