some session-* packages require the result library
They explicitly link against it.
Failures are all similar and look like the following
```
=== ERROR while compiling session-cookie-lwt.0.1.8 ===========================#
context 2.2.0~alpha4~dev | linux/x86_64 | ocaml-base-compiler.4.14.1 | file:///home/opam/opam-repository
path ~/.opam/4.14/.opam-switch/build/session-cookie-lwt.0.1.8
command ~/.opam/opam-init/hooks/sandbox.sh build dune build -p session-cookie-lwt -j 255 @install
exit-code 1
env-file ~/.opam/log/session-cookie-lwt-7-f8b6e2.env
output-file ~/.opam/log/session-cookie-lwt-7-f8b6e2.out
File "session-cookie-lwt/dune", line 4, characters 16-22:
4 | (libraries lwt result session-cookie))
^^^^^^
Error: Library "result" not found.
-> required by library "session-cookie-lwt" in
_build/default/session-cookie-lwt
-> required by _build/default/META.session-cookie-lwt
-> required by _build/install/default/lib/session-cookie-lwt/META
-> required by _build/default/session-cookie-lwt.install
-> required by alias install
```
Fixes https://github.com/ocaml/opam-repository/issues/24944
Signed-off-by: Marcello Seri <marcello.seri@gmail.com>