Use Var builder

clangml-transforms/for_memcad.ml

@@ -17,11 +17,7 @@ let fresh_var_name () =
 let declare_tmp qual_type =
   let tmp = fresh_var_name () in
   let decl_tmp = Clang.Ast.node ~qual_type (Clang.Ast.Decl [
-    Clang.Ast.node ~qual_type (Clang.Ast.Var {
-      linkage = NoLinkage;
-      var_name = tmp;
-      var_type = qual_type;
-      var_init = None })]) in
+    Clang.Ast.node ~qual_type (Clang.Ast.Var (Clang.Ast.var tmp qual_type))]) in
   let tmp_var = Clang.Ast.node ~qual_type (Clang.Ast.DeclRef (Ident tmp)) in
   tmp_var, decl_tmp