libxc: Drop declarations of osdep_privcmd_open and _close

These functions are no longer defined or used anywhere.  The
declarations should have been deleted when the definitions were.

Signed-off-by: Ian Jackson <Ian.Jackson@eu.citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>

tools/libxc/xc_private.h

@@ -100,9 +100,6 @@ struct xc_interface_core {
     xendevicemodel_handle *dmod;
 };
 
-int osdep_privcmd_open(xc_interface *xch);
-int osdep_privcmd_close(xc_interface *xch);
-
 void *osdep_alloc_hypercall_buffer(xc_interface *xch, int npages);
 void osdep_free_hypercall_buffer(xc_interface *xch, void *ptr, int npages);