test: add repro for ocaml#9272 (codesign regression)

test/blackbox-tests/test-cases/github9272.t

@@ -0,0 +1,31 @@
+  $ cat > dune-project << EOF
+  > (lang dune 3.0)
+  > (using dune_site 0.1)
+  > EOF
+
+  $ cat > dune << EOF
+  > (executable
+  >  (name hello)
+  >  (promote (until-clean))
+  >  (libraries dune-site))
+  > EOF
+
+  $ touch hello.ml
+
+  $ cat > exec.ml << EOF
+  > let () =
+  >   let pid =
+  >     Unix.create_process
+  >       "./hello.exe" [|"./hello.exe"|]
+  >       Unix.stdin Unix.stdout Unix.stderr
+  >   in
+  >   match Unix.waitpid [] pid with
+  >   | _, WEXITED n -> Printf.printf "WEXITED %d" n
+  >   | _, WSTOPPED n -> Printf.printf "WSTOPPED %d" n
+  >   | _, WSIGNALED n -> Printf.printf "WSIGNALED %d" n
+  > EOF
+
+  $ dune build
+
+  $ ocaml -I +unix unix.cma exec.ml
+  WSIGNALED -7