slightly improve wscript
c++ code for auto-update compiles

Change-Id: Iad2aebf330f8620573db3fec615d83086c94c779
diff --git a/osx/auto-update/auto-update.h b/osx/auto-update/auto-update.h
index 4313641..86068c8 100644
--- a/osx/auto-update/auto-update.h
+++ b/osx/auto-update/auto-update.h
@@ -24,6 +24,7 @@
 class AutoUpdate
 {
 public:
+  virtual ~AutoUpdate() {};
   virtual void checkForUpdates() = 0;
 };
 #endif