No need to special-case pointers in write_arg.
No need to special-case pointers in write_arg.

The catch-all case has the same behaviour.

dsheets/ocaml-ctypes,dsheets/ocaml-ctypes,sjfloat/ocaml-ctypes,sjfloat/ocaml-ctypes,fdopen/ocaml-ctypes,yallop/ocaml-ctypes,fdopen/ocaml-ctypes,whitequark/ocaml-ctypes,sjfloat/ocaml-ctypes,whitequark/ocaml-ctypes,ocamllabs/ocaml-ctypes,dsheets/ocaml-ctypes,fdopen/ocaml-ctypes,yallop/ocaml-ctypes,ocamllabs/ocaml-ctypes,whitequark/ocaml-ctypes