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/thread.cpp

@@ -690,7 +690,7 @@ wxThreadInternal::WaitForTerminate(wxCriticalSection& cs,
         // process the Windows messages that result from these functions
         // (note that even in console applications we might have to process
         // messages if we use wxExecute() or timers or ...)
-        DWORD result = 0;       // suppress warnings from broken compilers
+        DWORD result wxDUMMY_INITIALIZE(0);
         do
         {
             if ( wxThread::IsMain() )