fix compilation without WXDEBUG (includes patch 561458)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@15701 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/x11/app.h

@@ -74,7 +74,9 @@ public:
     // Processes an X event.
     virtual bool ProcessXEvent(WXEvent* event);
     
+#ifdef __WXDEBUG__
     virtual void OnAssert(const wxChar *file, int line, const wxChar *msg);
+#endif // __WXDEBUG__
     
 protected:
     bool                  m_showOnInit;

src/x11/app.cpp

@@ -1219,6 +1219,8 @@ bool wxApp::Yield(bool onlyIfNeeded)
     return TRUE;
 }
 
+#ifdef __WXDEBUG__
+
 void wxApp::OnAssert(const wxChar *file, int line, const wxChar *msg)
 {
     // While the GUI isn't working that well, just print out the
@@ -1232,3 +1234,5 @@ void wxApp::OnAssert(const wxChar *file, int line, const wxChar *msg)
 #endif
 }
 
+#endif // __WXDEBUG__
+