Add Microsoft.VisualStudio.ComponentGroup.NativeDesktop.Win81 to required workloads

korebuild.json

@@ -7,7 +7,8 @@
         "includePrerelease": true,
         "minVersion": "15.0.26730.03",
         "requiredWorkloads": [
-          "Microsoft.VisualStudio.Component.VC.Tools.x86.x64"
+          "Microsoft.VisualStudio.Component.VC.Tools.x86.x64",
+          "Microsoft.VisualStudio.ComponentGroup.NativeDesktop.Win81"
         ]
       }
     }