File/dir dialog styles and other changes (patch 1488371):

- check invalid combinations of styles in wxFileDialogBase::Create()
- use wxFD_XXX naming convention for wxFileDialog styles
- replaces wxDD_NEW_DIR_BUTTON with wxDD_DIR_MUST_EXIST
- removes #ifdef __WXGTK24__ / #endif blocks from wxGTK code
- removes wxFileDialogBase::Get/SetStyle and wxFileDialogBase::m_fileName
- renames wxDirDialogGTK to wxDirDialog


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39402 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

contrib/samples/animate/anitest.cpp

@@ -154,7 +154,7 @@ void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event) )
 void MyFrame::OnOpen(wxCommandEvent& WXUNUSED(event))
 {
     wxFileDialog dialog(this, _T("Please choose an animated GIF"),
-        wxEmptyString, wxEmptyString, wxT("*.gif"), wxOPEN);
+        wxEmptyString, wxEmptyString, wxT("*.gif"), wxFD_OPEN);
     if (dialog.ShowModal() == wxID_OK)
     {
         wxString filename(dialog.GetPath());