Add missing ocaml dependency to unisim_archisec

Followup to #27456

Author: shonfeder

packages/unisim_archisec/unisim_archisec.0.0.10/opam

@@ -12,6 +12,7 @@ license: "BSD-3-Clause"
 homepage: "https://binsec.github.io"
 bug-reports: "mailto:[email protected]"
 depends: [
+  "ocaml" {>= "4.08"}
   "dune" {>= "3.0"}
   "conf-gcc" {build}
   "conf-g++" {build}