OS/2 Updates

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@6870 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/os2/app.h

@@ -30,6 +30,12 @@ void WXDLLEXPORT wxExit(void);
 // Yield to other apps/messages
 bool WXDLLEXPORT wxYield(void);
 
+extern MRESULT EXPENTRY wxWndProc( HWND
+                                  ,ULONG
+                                  ,MPARAM
+                                  ,MPARAM
+                                 );
+
 // Represents the application. Derive OnInit and declare
 // a new App object to start application
 class WXDLLEXPORT wxApp : public wxAppBase