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/filedlg.cpp

@@ -193,7 +193,7 @@ wxString wxFileSelectorEx(const wxChar *title,
 
 wxFileDialog::wxFileDialog(wxWindow *parent, const wxString& message,
         const wxString& defaultDir, const wxString& defaultFileName, const wxString& wildCard,
-        long style, const wxPoint& pos)
+        long style, const wxPoint& WXUNUSED(pos))
 {
     m_message = message;
     m_dialogStyle = style;