Hi Guix!

I created a long patch series (67 patches) to remove ocaml 4.07
packages. The series keeps ocaml@4.07 itself, as well as findlib and
dune, so we can always build ocaml4.07 packages later if we want to (we
might need to build at least menhir, that will be required to build
ocaml>4.07)

I don't think it requires QA, since we're only removing packages.
Patches look like the attached patch. If you agree with this in
principle, I'll push the series this week.

I checked that each intermediate commit builds (no unbound variable),
used guix refresh to discover a proper order (removing leaf packages).
If you prefer, I can send the whole series.