https://github.com/ocamllabs/ocaml-ctypes/blob/0.18.0/CHANGES.md#ctypes-0180
* ocamlPackages.async_ssl: fix compatibility with ctypes 0.18.0 by using
ctypes.foreign instead of ctypes.foreign.threaded since the distinction
between threaded and unthreaded has been removed in this release.
* libbap: link with -thread so linking ctypes.foreign doesn't fail
https://github.com/BinaryAnalysisPlatform/bap-bindings/issues/18
* ocaml-ng.ocamlPackages_4_07.sodium: patch lib_gen/_tags to also add
the `package(bigarray)` directive since `ctypes.stubs` no longer
propgates that, leading to module not found error.
* ocaml-ng.ocamlPackages_4_{04,05,06,07}.async_ssl: mark as broken: due to
the bigarray-compat dependency, we need dune 2 for ctypes which breaks
compilation of the legacy async_ssl 0.11 version since we can't
upgrade to dune 2 for it since that version doesn't support the legacy
jbuild files.
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