make wxThread::OnExit private and not public (change tested on wxMSW and wxGTK)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@56984 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/thread.h

@@ -1058,17 +1058,6 @@ public:
     */
     wxThreadError Kill();
 
-    /**
-        Called when the thread exits.
-
-        This function is called in the context of the thread associated with the
-        wxThread object, not in the context of the main thread.
-        This function will not be called if the thread was @ref Kill() killed.
-
-        This function should never be called directly.
-    */
-    virtual void OnExit();
-
     /**
         Suspends the thread.
 
@@ -1227,6 +1216,19 @@ protected:
         OnExit() will be called just before exiting.
     */
     void Exit(ExitCode exitcode = 0);
+
+private:
+
+    /**
+        Called when the thread exits.
+
+        This function is called in the context of the thread associated with the
+        wxThread object, not in the context of the main thread.
+        This function will not be called if the thread was @ref Kill() killed.
+
+        This function should never be called directly.
+    */
+    virtual void OnExit();
 };