Allow for different extern names for different backends

For example:

val test = { ocaml: "test_ocaml", lem: "test_lem" } : unit -> unit

val main : unit -> unit

function main () = {
  test ();
}

for a backend not explicitly provided, the extern name would be simply
"test" in this case, i.e. the string version of the id.

Also fixed some bugs in the ocaml backend.

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