bzip2_1_1: remove

Unmaintained 2020 git snapshot with no remaining in-tree users now
that hdf5plugin builds against the standard bzip2.

Assisted-by: claude-code with claude-opus-4-8[1m]-high

pkgs/tools/compression/bzip2/1_1.nix

@@ -1,55 +0,0 @@
-{
-  lib,
-  stdenv,
-  fetchFromGitLab,
-  meson,
-  python3,
-  ninja,
-  testers,
-}:
-
-stdenv.mkDerivation (finalAttrs: {
-  pname = "bzip2-unstable";
-  version = "2020-08-11";
-
-  src = fetchFromGitLab {
-    owner = "federicomenaquintero";
-    repo = "bzip2";
-    rev = "15255b553e7c095fb7a26d4dc5819a11352ebba1";
-    hash = "sha256-BAyz35D62LWi47B/gNcCSKpdaECHBGSpt21vtnk3fKs=";
-  };
-
-  postPatch = ''
-    patchShebangs install_links.py
-  '';
-
-  nativeBuildInputs = [
-    meson
-    python3
-    ninja
-  ];
-
-  outputs = [
-    "bin"
-    "dev"
-    "out"
-    "man"
-  ];
-
-  mesonFlags = [
-    "-Ddocs=disabled"
-  ];
-
-  strictDeps = true;
-
-  passthru.tests.pkg-config = testers.testMetaPkgConfig finalAttrs.finalPackage;
-
-  meta = {
-    description = "High-quality data compression program";
-    homepage = "https://gitlab.com/federicomenaquintero/bzip2";
-    license = lib.licenses.bzip2;
-    pkgConfigModules = [ "bz2" ];
-    platforms = lib.platforms.all;
-    maintainers = [ ];
-  };
-})

pkgs/top-level/aliases.nix

@@ -423,6 +423,7 @@ mapAliases {
   buildXenPackage = throw "'buildXenPackage' has been removed as a custom Xen build can now be achieved by simply overriding 'xen'."; # Added 2025-05-12
   bullet-roboschool = throw "'bullet-roboschool' has been removed as its build was broken and it was deprecated with its last update in 2019."; # Added 2025-11-15
   bwidget = throw "'bwidget' has been renamed to/replaced by 'tclPackages.bwidget'"; # Converted to throw 2025-10-27
+  bzip2_1_1 = throw "'bzip2_1_1' has been removed as it was an unmaintained 2020 snapshot with no remaining users; use 'bzip2' instead"; # Added 2026-05-31
   bzrtp = throw "'bzrtp' has been moved to 'linphonePackages.bzrtp'"; # Added 2025-09-20
   c0 = throw "'c0' has been removed due to being broken for more than a year; see RFC 180"; # Added 2026-02-05
   caido = warnAlias "'caido' has been split into 'caido-cli' and 'caido-desktop'." caido-desktop; # Added 2026-03-03

pkgs/top-level/all-packages.nix

@@ -1888,8 +1888,6 @@ with pkgs;
 
   bzip2 = callPackage ../tools/compression/bzip2 { };
 
-  bzip2_1_1 = callPackage ../tools/compression/bzip2/1_1.nix { };
-
   davix-copy = davix.override { enableThirdPartyCopy = true; };
 
   libceph = ceph.lib;