ocamlPackages.camlzip: make use of lib.licenses

pkgs/development/ocaml-modules/camlzip/default.nix

@@ -90,7 +90,10 @@ stdenv.mkDerivation {
       ZIP and GZIP format, as well as to Java JAR files.  It provides functions
       for reading from and writing to compressed files in these formats.
     '';
-    license = "LGPL+linking exceptions";
+    license = with lib.licenses; [
+      lgpl21Plus
+      ocamlLgplLinkingException
+    ];
     inherit (ocaml.meta) platforms;
     maintainers = with maintainers; [ maggesi ];
   };