Users need to import packages other than `hs-bindgen-runtime`

[dschrempf]

Pulling along the hs-bindgen Nix tutorial, I noticed that we now have to add build dependencies primitive and ghc-prim.

I think the declarations we use from there should be re-exported from hs-bindgen-runtime (but there may be complications I am not aware of).

I am leaving this ticket here, so we don't forget to discuss this.

Relevant error:

       > src/Generated/Pcap.hs:26:1: error: [GHC-87110]
       >     Could not load module ‘Data.Primitive.Types’.
       >     It is a member of the hidden package ‘primitive-0.9.1.0’.
       >     Perhaps you need to add ‘primitive’ to the build-depends in your .cabal file.
       >     Use -v to see a list of the files searched for.
       >    |
       > 26 | import qualified Data.Primitive.Types
       >    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
       >
       > src/Generated/Pcap.hs:40:1: error: [GHC-87110]
       >     Could not load module ‘GHC.Prim’.
       >     It is a member of the hidden package ‘ghc-prim-0.12.0’.
       >     Perhaps you need to add ‘ghc-prim’ to the build-depends in your .cabal file.
       >     Use -v to see a list of the files searched for.
       >    |
       > 40 | import GHC.Prim ((*#), (+#))