Update: in lurette, do not use the stdio mode when -exec is provided to lv6

lurette-nocaml/src/lurette.ml

-(* Time-stamp: <modified the 11/07/2019 (at 14:56) by Erwan Jahier> *)
+(* Time-stamp: <modified the 02/08/2019 (at 14:38) by Erwan Jahier> *)
 (* Mimick the behavior of 'rdbg -lurette', but without the dependency
    on ocaml *)
 open Event
@@ -57,7 +57,6 @@ let (gen_reactive_program : string -> RdbgArg.reactive_program) =
       | "lutin"   -> LutinRun.make (Array.of_list args)
       | "lv6" | "lus2lic" ->
         if
-          List.mem "-exec" args ||
           List.mem "-2c-exec" args ||
           List.mem "--to-c-execute" args
         then