Build is broken due to undeclared opam dependencies

[torinnd]

Ocaml-CI is sad about some undeclared dependencies:

/src: (run (shell "opam exec -- dune build @install @check @runtest && rm -rf _build"))
File "benchmarks/dune", line 3, characters 16-26:
3 |  (libraries uri core_bench))
                    ^^^^^^^^^^
Error: Library "core_bench" not found.
-> required by _build/default/benchmarks/.benchmark.eobjs/byte/benchmark.cmi
-> required by alias benchmarks/check
File "fuzz/dune", line 3, characters 40-43:
3 |  (libraries uri uri-re uri-sexp crowbar fmt))
                                            ^^^
Error: Library "fmt" not found.
-> required by _build/default/fuzz/.fuzz.eobjs/byte/fuzz.cmi
-> required by alias fuzz/check
(cd _build/default/lib_test && ./test_runner.exe)

#164 is stuck until that gets sorted. I imagine all other PRs are in a similar state of limbo.

[tmcgilchrist]

Thanks for reporting @torinnd. I've merged the fix in #166