Add license for ocaml-inifiles (#27697)

Author: mseri

packages/ocaml-inifiles/ocaml-inifiles.1.2/opam

@@ -1,5 +1,6 @@
 opam-version: "2.0"
 maintainer: "https://github.com/ocaml/opam-repository/issues"
+license: "LGPL-2.1-or-later"
 build: [
   [make "all"]
   [make "opt"]