Updates to fix Watcom C/C++ 11.0 compiler warning problems. Now compiles

clean with this compiler. Hopefully I did this without breaking other
compilers.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@9967 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/dc.cpp

@@ -1171,7 +1171,7 @@ void wxDC::SetRop(WXHDC dc)
     SetROP2(GetHdc(), rop);
 }
 
-bool wxDC::StartDoc(const wxString& message)
+bool wxDC::StartDoc(const wxString& WXUNUSED(message))
 {
     // We might be previewing, so return TRUE to let it continue.
     return TRUE;