[ghost] Copyright header for a ghost qualifier test

tests/syntax/ghost_cv_var_decl.ml

 (**************************************************************************)
-(*  This file is part of Medium plug-in of Frama-C.                       *)
 (*                                                                        *)
-(*  Copyright (C) 2018 - Inria Lille - Nord Europe                        *)
-(*    Allan Blanchard                                                     *)
+(*  This file is part of Frama-C.                                         *)
+(*                                                                        *)
+(*  Copyright (C) 2007-2020                                               *)
+(*    CEA   (Commissariat à l'énergie atomique et aux énergies            *)
+(*           alternatives)                                                *)
+(*    INRIA (Institut National de Recherche en Informatique et en         *)
+(*           Automatique)                                                 *)
 (*                                                                        *)
 (*  you can redistribute it and/or modify it under the terms of the GNU   *)
 (*  Lesser General Public License as published by the Free Software       *)
-(*  Foundation, version 3.                                                *)
+(*  Foundation, version 2.1.                                              *)
 (*                                                                        *)
 (*  It is distributed in the hope that it will be useful,                 *)
 (*  but WITHOUT ANY WARRANTY; without even the implied warranty of        *)
 (*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *)
 (*  GNU Lesser General Public License for more details.                   *)
 (*                                                                        *)
-(*  See the GNU Lesser General Public License version 3                   *)
-(*  for more details (enclosed in the file LICENCE).                      *)
-(*                                                                        *)
 (**************************************************************************)
 
 open Cil_types