[headers] No headers in tests

tests/syntax/ghost_cv_var_decl.ml

-(**************************************************************************)
-(*                                                                        *)
-(*  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 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.                   *)
-(*                                                                        *)
-(**************************************************************************)
-
 open Cil_types
 
 let rec ghost_status fmt lval =