Remove ATSU-related dead code from wxOSX

ATSU was deprecated for a long time and was finally removed from OS X
SDK in 10.11. wxOSX_USE_ATSU_TEXT was unconditionally disabled already,
so the code was never used and can be safely removed.

include/wx/fontutil.h

@@ -158,21 +158,10 @@ public:
                   wxFontEncoding encoding);
 
     void Free();
-    void EnsureValid();
     
     static void UpdateNamesMap(const wxString& familyname, CTFontDescriptorRef descr);
     static void UpdateNamesMap(const wxString& familyname, CTFontRef font);
 
-    bool m_descriptorValid;
-
-#if wxOSX_USE_ATSU_TEXT
-    bool            m_atsuFontValid;
-    // the atsu font ID
-    wxUint32        m_atsuFontID;
-    // the qd styles that are not intrinsic to the font above
-    wxInt16         m_atsuAdditionalQDStyles;
-#endif
-
     int           m_pointSize;
     wxFontFamily  m_family;
     wxFontStyle   m_style;

include/wx/osx/cocoa/chkconf.h

@@ -26,12 +26,6 @@
     #define wxOSX_USE_NATIVE_FLIPPED 1
 #endif
 
-/*
- * text rendering system
- */
-
-#define wxOSX_USE_ATSU_TEXT 0
-
 /*
  * Audio System
  */

include/wx/osx/font.h

@@ -145,15 +145,6 @@ public:
 
     CTFontRef OSXGetCTFont() const;
 
-#if wxOSX_USE_ATSU_TEXT
-    // Returns an ATSUStyle not ATSUStyle*
-    void* MacGetATSUStyle() const ;
-    void* OSXGetATSUStyle() const { return MacGetATSUStyle() ; }
-
-    wxDEPRECATED( wxUint32 MacGetATSUFontID() const );
-    wxDEPRECATED( wxUint32 MacGetATSUAdditionalQDStyles() const );
-#endif
-
 #if wxOSX_USE_COCOA
     WX_NSFont OSXGetNSFont() const;
     static WX_NSFont OSXCreateNSFont(wxOSXSystemFont font, wxNativeFontInfo* info);

include/wx/osx/iphone/chkconf.h

@@ -19,7 +19,6 @@
  * under a certain platform
  */
 
-#define wxOSX_USE_ATSU_TEXT 0
 #define wxHAS_OPENGL_ES
 
 #define wxOSX_USE_QUICKTIME 0