Prevent comby from building on dune 3.13
With the stricter checking of opam-compatible package names in dune
3.13, some packages with invalid syntax in their dune-project fail to
build. comby vendored camplzip with an invalid dune-project, though
that file has been removed 3 years ago and no longer creates issues:
https://github.com/comby-tools/comby/pull/263/files#diff-c2c1b8548cad59a69f8dd1a1531f11d345ff8fc8e7e3e922bce9604e9dd645c7
Newer version of comby exist and build successfully.
Examples of failing builds:
https://opam.ci.ocaml.org/github/ocaml/opam-repository/commit/fa3e075e57439140df4aacda519ec59df15e0b66/variant/compilers,4.14,dune-configurator.3.13.0~alpha1,revdeps,comby.1.2.2
https://opam.ci.ocaml.org/github/ocaml/opam-repository/commit/fa3e075e57439140df4aacda519ec59df15e0b66/variant/compilers,4.14,dune-configurator.3.13.0~alpha1,revdeps,comby.1.3.0