[bug#33079] [WIP] ocaml updates

[Julien Lepiller]

Hi guix,

I've updated the ocaml compiler to the latest version, but that breaks
most of our packages. I've added some new packages, updated others and
added inputs to the rest. As you can see some packages require non
trivial changes.

Right now, I have 33 small patches and one big patch that I might have
to split if you think it's necessary. It's a lot of work, so I'd prefer
if you told me it was ok to push the big patch as one, but I can also
work a bit more and split it too.

What do you think?