libxml2: get rid of generic arguments

pkgs/development/libraries/libxml2/default.nix

@@ -1,11 +1,12 @@
 {
   stdenv,
+  darwin,
   lib,
   fetchFromGitLab,
   pkg-config,
   autoreconfHook,
   libintl,
-  python,
+  python3,
   gettext,
   ncurses,
   findXMLCatalogs,
@@ -31,7 +32,13 @@
   enableHttp ? false,
 }:
 
-stdenv.mkDerivation (finalAttrs: {
+let
+  python = python3;
+  # libxml2 is a dependency of xcbuild. Avoid an infinite recursion by using a bootstrap stdenv
+  # that does not propagate xcrun.
+  stdenv' = if stdenv.hostPlatform.isDarwin then darwin.bootstrapStdenv else stdenv;
+in
+stdenv'.mkDerivation (finalAttrs: {
   pname = "libxml2";
   version = "2.14.5";
 

pkgs/top-level/all-packages.nix

@@ -8835,13 +8835,7 @@ with pkgs;
   libxcrypt-legacy = libxcrypt.override { enableHashes = "all"; };
 
   libxkbcommon = libxkbcommon_8;
-  libxml2 = callPackage ../development/libraries/libxml2 {
-    python = python3;
-    stdenv =
-      # libxml2 is a dependency of xcbuild. Avoid an infinite recursion by using a bootstrap stdenv
-      # that does not propagate xcrun.
-      if stdenv.hostPlatform.isDarwin then darwin.bootstrapStdenv else stdenv;
-  };
+  libxml2 = callPackage ../development/libraries/libxml2 { };
 
   libxml2Python =
     let

pkgs/top-level/python-packages.nix

@@ -8234,7 +8234,7 @@ self: super: with self; {
     (toPythonModule (
       pkgs.libxml2.override {
         pythonSupport = true;
-        inherit python;
+        python3 = python;
       }
     )).py;