Add support for the eventual inclusion of the single instance code.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@10459 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/os2/app.h

@@ -117,6 +117,7 @@ public:
     static void  CleanUp(void);
 
     static bool  RegisterWindowClasses(HAB vHab);
+    virtual void DoMessage(WXMSG *pMsg);
     virtual bool DoMessage(void);
     virtual bool ProcessMessage(WXMSG* pMsg);
     void         DeletePendingObjects(void);

include/wx/os2/setup.h

@@ -327,5 +327,8 @@
 #define wxUSE_GENERIC_DIALOGS_IN_OS2 0
                                 // Define 1 to use generic dialogs in Windows, even though
                                 // they duplicate native common dialog (e.g. wxColourDialog)
+
+#define wxUSE_SNGLINST_CHECKER  1
+
 #endif
     // _WX_SETUP_H_

include/wx/os2/setup0.h

@@ -326,5 +326,8 @@
 #define wxUSE_GENERIC_DIALOGS_IN_OS2 0
                                 // Define 1 to use generic dialogs in Windows, even though
                                 // they duplicate native common dialog (e.g. wxColourDialog)
+
+#define wxUSE_SNGLINST_CHECKER  1
+
 #endif
     // _WX_SETUP_H_