warning fixes for BCC and OW (heavily modified patch 819146)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@24196 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/toplevel.cpp

@@ -445,7 +445,7 @@ bool wxTopLevelWindowMSW::Create(wxWindow *parent,
                                  long style,
                                  const wxString& name)
 {
-    bool ret = false;
+    bool ret wxDUMMY_INITIALIZE(false);
 
     // init our fields
     Init();