1. Moved m_usePrimary to wxClipboardBase as it's now also used by wxMSW/wxMac

2. Added IsUsingPrimarySelection()
3. Fail all clipboard operations when IsUsingPrimarySelection() is true on
   non-X11 platforms


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@45183 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/mac/carbon/clipbrd.h

@@ -63,9 +63,6 @@ public:
     // eating memory), otherwise the clipboard will be emptied on exit
     virtual bool Flush();
 
-    // X11 has two clipboards which get selected by this call. Empty on MSW.
-    void UsePrimarySelection( bool WXUNUSED(primary) = FALSE ) { }
-
 private:
     wxDataObject     *m_data;
     bool              m_open;
@@ -73,5 +70,4 @@ private:
 
 #endif // wxUSE_CLIPBOARD
 
-#endif
-    // _WX_CLIPBRD_H_
+#endif // _WX_CLIPBRD_H_