Remove unused helpxxxx.{h,cpp} stub files from wxOSX

These files seem to be left overs from a long, long time ago.

include/wx/osx/helpxxxx.h

@@ -1,48 +0,0 @@
-/////////////////////////////////////////////////////////////////////////////
-// Name:        wx/osx/helpxxxx.h
-// Purpose:     Help system: native implementation for your system. Replace
-//              XXXX with suitable name.
-// Author:      Stefan Csomor
-// Modified by:
-// Created:     1998-01-01
-// Copyright:   (c) Stefan Csomor
-// Licence:     wxWindows licence
-/////////////////////////////////////////////////////////////////////////////
-
-#ifndef _WX_HELPXXXX_H_
-#define _WX_HELPXXXX_H_
-
-#include "wx/wx.h"
-
-#include "wx/helpbase.h"
-
-class WXDLLIMPEXP_CORE wxXXXXHelpController: public wxHelpControllerBase
-{
-  wxDECLARE_CLASS(wxXXXXHelpController);
-
- public:
-  wxXXXXHelpController();
-  virtual ~wxXXXXHelpController();
-
-  // Must call this to set the filename and server name
-  virtual bool Initialize(const wxString& file);
-
-  // If file is "", reloads file given  in Initialize
-  virtual bool LoadFile(const wxString& file = "");
-  virtual bool DisplayContents();
-  virtual bool DisplaySection(int sectionNo);
-  virtual bool DisplayBlock(long blockNo);
-  virtual bool KeywordSearch(const wxString& k,
-                             wxHelpSearchMode mode = wxHELP_SEARCH_ALL);
-
-  virtual bool Quit();
-  virtual void OnQuit();
-
-  inline wxString GetHelpFile() const { return m_helpFile; }
-
-protected:
-  wxString m_helpFile;
-};
-
-#endif
-    // _WX_HELPXXXX_H_