Orphaning some packages which depend on camlp4

<a href=" ... at lists dot" title=" ... at lists dot"> ... at lists dot fedoraproject....</a>

camlp4 is (was) a grammar extension/macro package for OCaml. It was
replaced upstream by PPX extensions a while back, but quite a few
packages still used camlp4.

Since we updated OCaml to 4.08 there has been no work on upgrading
camlp4 to work with the new version. I asked about it upstream but
didn't get a positive response:

<a href=" ... at baturin dot org/T/#m7e16e560be45003a819d544600ced5645f56b6a0" title=" ... at baturin dot org/T/#m7e16e560be45003a819d544600ced5645f56b6a0"> ... at b dot ..</a>

The only packages I care about which use camlp4 is ocaml-gettext, and
I recently ported that to use PPX instead:

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Other packages in Fedora 31 which depend on ocaml-camlp4 or
ocaml-camlp4-devel will no longer build, and I will eventually either
orphan them or (if upstream has replaced camlp4) update them.

*** Affected packages ***

cduce (Modern XML-oriented functional language)

guestfs-browser (Guest filesystem browser)

- This was basically a demo that I wrote years ago.

ocaml-bin-prot (Read and write OCaml values in a type-safe binary protocol)

- There is a new PPX version of this project, but it would need to be
packaged by someone who is interested in it.

ocaml-bisect (OCaml code coverage tool)

- Since this was written a long time ago, OCaml now generates DWARF
and profiling information in standard formats, so use ordinary
tools instead.

ocaml-bitstring (OCaml library for matching and constructing bitstrings)

- There is a new project upstream which ports this to PPX but it
would probably need to be added as a fresh package.

ocaml-camlp4 (Pre-Processor-Pretty-Printer for OCaml)

ocaml-deriving (Extension to OCaml for deriving functions from types)

- There is a new project upstream which ports this to PPX. If you
want this, please package the new project.

ocaml-json-static (OCaml JSON validator and converter (syntax extension))
ocaml-json-wheel (OCaml library for parsing JSON)

- These libraries are both obsolete. There are other newer projects
for parsing and creating JSON strings from OCaml.

ocaml-mikmatch (OCaml extension for pattern matching with regexps)

- Also obsolete; there are newer libraries upstream.

ocaml-lablgl (GL bindings)

- Dead upstream since 2013.

ocaml-openin (OCaml syntax to locally open modules)
ocaml-pa-monad (OCaml syntax extension for monads)

- Both obsolete syntax extensions, now part of the core language.

ocaml-pgocaml (OCaml library for type-safe access to PostgreSQL databases)

- There is a new PPX port of this package. Someone could package this
if interested.

ocaml-pxp (XML parser)

- As far as I can tell this hasn't been ported to either PPX or

ocaml-sexplib (OCaml library for converting OCaml values to S-expressions)
ocaml-type-conv (OCaml base library for type conversion)

- Both versions we are packaging are obsolete. There are PPX
versions upstream which someone can package.

ocamldsort (Dependency sorter for OCaml source files)

- Obsolete, use built-in tool ocamldep.