bat: unvendor zlib; fix darwin

bat fails with
> error: failed to run custom build command for `libz-sys v1.1.8`
due to the vendored libz failing to build with clang-19

the apple-sdk_11 can also be removed as that is now the default for both
darwin x64 and aarch64

pkgs/by-name/ba/bat/package.nix

@@ -5,10 +5,9 @@
   fetchFromGitHub,
   pkg-config,
   less,
-  libiconv,
   installShellFiles,
   makeWrapper,
-  apple-sdk_11,
+  zlib,
 }:
 
 rustPlatform.buildRustPackage rec {
@@ -29,9 +28,8 @@ rustPlatform.buildRustPackage rec {
     makeWrapper
   ];
 
-  buildInputs = lib.optionals stdenv.hostPlatform.isDarwin [
-    libiconv
-    apple-sdk_11
+  buildInputs = [
+    zlib
   ];
 
   postInstall = ''