Bug#803887: Downstream issue

[Gabriel Scherer]

For the record, we checked upstream (with Luc Maranget, who wrote the
latex->info converter used by the OCaml manual) and production of info
files still reliable works upstream. I didn't follow all the details
but apparently the build process produced a temporary file
(ocaml.info.body) that might have confused Debian packagers, and Luc
removed it from trunk:
  https://github.com/ocaml/ocaml/commit/533e0cdd29cc70773703f47acede8ee45aea5591