Fix the native dynlink detection on OCaml 5.0

[kit-ty-kate]

Causes the packages using topkg to build to not install their cmxs files

[dbuenzli]

Thank you! Your patch is in as e30927fed486e4642e9f1. Do you expect more or should I push a release asap ?

[kit-ty-kate]

I don't have anything else that I know of and a release asap would be very much appreciated ^^

The thing that's a little annoying is that it's not gonna fix any of your packages automatically since topkg is always a {build} dependency so they won't get recompiled

[dbuenzli]

https://github.com/ocaml/opam-repository/pull/22449