Menhir update test: use POSIX (find .. -prune -newer) instead of bash's -nt
Menhir update test: use POSIX (find .. -prune -newer) instead of bash's -nt

gerdstolpmann/ocaml,gerdstolpmann/ocaml,gerdstolpmann/ocaml,gerdstolpmann/ocaml,gerdstolpmann/ocaml