botan2: remove

Removing botan2 from nixpkgs.
Botan2 has been end-of-life since 2025-01-01 and was replaced with Botan3.

Fixes: #445861

pkgs/development/libraries/botan/default.nix

@@ -1,7 +1,6 @@
 {
   lib,
   stdenv,
-  fetchpatch,
   fetchurl,
   pkgsStatic,
   python3,
@@ -146,7 +145,7 @@ let
 
       doCheck = true;
 
-      passthru.tests = lib.optionalAttrs (lib.versionAtLeast version "3") {
+      passthru.tests = {
         static = pkgsStatic.botan3;
       };
 
@@ -159,7 +158,7 @@ let
           thillux
           nikstur
         ];
-        platforms = platforms.unix ++ lib.optionals (lib.versionAtLeast version "3.0") platforms.windows;
+        platforms = platforms.unix ++ platforms.windows;
         license = licenses.bsd2;
       };
     });
@@ -169,17 +168,4 @@ in
     version = "3.9.0";
     hash = "sha256-jD8oS1jd1C6OQ+n6hqcSnYfqfD93aoDT2mPsIHIrCIM=";
   };
-
-  botan2 = common {
-    version = "2.19.5";
-    hash = "sha256-3+6g4KbybWckxK8B2pp7iEh62y2Bunxy/K9S21IsmtQ=";
-    patches = [
-      # Fix build with gcc15
-      (fetchpatch {
-        name = "botan2-add-include-cstdint-gcc15.patch";
-        url = "https://src.fedoraproject.org/rpms/botan2/raw/c3fb7a3800df117e7ef8a7617ac8eacb31a4464a/f/f765f0b312f2998498f629d93369babfb2c975b4.patch";
-        hash = "sha256-8Yhxd5TCgxUMtRiv3iq5sQaVjDF+b9slppm38/6l6lw=";
-      })
-    ];
-  };
 }

pkgs/top-level/aliases.nix

@@ -563,6 +563,7 @@ mapAliases {
   boost184 = throw "Boost 1.84 has been removed as it is obsolete and no longer used by anything in Nixpkgs"; # Added 2024-11-24
   boost185 = throw "Boost 1.85 has been removed as it is obsolete and no longer used by anything in Nixpkgs"; # Added 2024-11-24
   boost_process = throw "boost_process has been removed as it is included in regular boost"; # Added 2024-05-01
+  botan2 = throw "botan2 has been removed as it is EOL"; # Added 2025-10-20
   bower2nix = throw "bower2nix has been removed as bower was removed. It is recommended to migrate to yarn."; # Added 2025-09-17
   bpb = throw "bpb has been removed as it is unmaintained and not compatible with recent Rust versions"; # Added 2024-04-30
   bpftool = throw "'bpftool' has been renamed to/replaced by 'bpftools'"; # Converted to throw 2024-10-17

pkgs/top-level/all-packages.nix

@@ -7012,7 +7012,6 @@ with pkgs;
       # botan3 only sensibly works with libcxxStdenv when building static binaries
       stdenv = if stdenv.hostPlatform.isStatic then buildPackages.libcxxStdenv else stdenv;
     })
-    botan2
     botan3
     ;
   botanEsdm = botan3.override { withEsdm = true; };