ocamlPackages.poll: migrate to finalAttrs

pkgs/development/ocaml-modules/poll/default.nix

@@ -8,14 +8,14 @@
   ppx_optcomp,
 }:
 
-buildDunePackage rec {
+buildDunePackage (finalAttrs: {
   pname = "poll";
   version = "0.3.1";
 
   minimalOCamlVersion = "4.13";
 
   src = fetchurl {
-    url = "https://github.com/anuragsoni/poll/releases/download/${version}/poll-${version}.tbz";
+    url = "https://github.com/anuragsoni/poll/releases/download/${finalAttrs.version}/poll-${finalAttrs.version}.tbz";
     hash = "sha256-IX6SivK/IMQaGgMgWiIsNgUSMHP6z1E/TSB0miaQ8pw=";
   };
 
@@ -37,8 +37,8 @@ buildDunePackage rec {
   meta = {
     description = "Portable OCaml interface to macOS/Linux/Windows native IO event notification mechanisms";
     homepage = "https://github.com/anuragsoni/poll";
-    changelog = "https://github.com/anuragsoni/poll/blob/${version}/CHANGES.md";
+    changelog = "https://github.com/anuragsoni/poll/blob/${finalAttrs.version}/CHANGES.md";
     license = lib.licenses.mit;
     maintainers = with lib.maintainers; [ sixstring982 ];
   };
-}
+})