libxslt: make python3 an input

pkgs/development/libraries/libxslt/default.nix

···
-{ lib, stdenv, fetchurl, fetchpatch, libxml2, findXMLCatalogs, gettext, python, libgcrypt
+{ lib, stdenv, fetchurl, fetchpatch, libxml2, findXMLCatalogs, gettext, python3, libgcrypt
 , cryptoSupport ? false
 , pythonSupport ? stdenv.buildPlatform == stdenv.hostPlatform
 }:
···
 
   buildInputs = [ libxml2.dev ]
     ++ lib.optional stdenv.isDarwin gettext
-    ++ lib.optionals pythonSupport [ libxml2.py python ]
+    ++ lib.optionals pythonSupport [ libxml2.py python3 ]
     ++ lib.optionals cryptoSupport [ libgcrypt ];
 
   propagatedBuildInputs = [ findXMLCatalogs ];
···
     "--without-debug"
     "--without-mem-debug"
     "--without-debugger"
-  ] ++ lib.optional pythonSupport "--with-python=${python}"
+  ] ++ lib.optional pythonSupport "--with-python=${python3}"
     ++ lib.optional (!cryptoSupport) "--without-crypto";
 
   postFixup = ''
···
   '' + lib.optionalString pythonSupport ''
     mkdir -p $py/nix-support
     echo ${libxml2.py} >> $py/nix-support/propagated-build-inputs
-    moveToOutput ${python.libPrefix} "$py"
+    moveToOutput ${python3.libPrefix} "$py"
   '';
 
   passthru = {

pkgs/top-level/all-packages.nix

···
 
   libxmp = callPackage ../development/libraries/libxmp { };
 
-  libxslt = callPackage ../development/libraries/libxslt {
-    python = python3;
-  };
+  libxslt = callPackage ../development/libraries/libxslt { };
 
   libxsmm = callPackage ../development/libraries/libxsmm { };
 

pkgs/top-level/python-packages.nix

···
 
   libxslt = (toPythonModule (pkgs.libxslt.override {
     pythonSupport = true;
-    inherit python;
+    python3 = python;
     inherit (self) libxml2;
   })).py;