git-bz: stay with python2

pkgs/applications/version-management/git-and-tools/git-bz/default.nix

···
 { lib, stdenv, fetchgit
 , asciidoc, docbook_xml_dtd_45, docbook_xsl, libxslt, makeWrapper, xmlto
-, pythonPackages }:
+, python2Packages }:
 
 stdenv.mkDerivation {
   pname = "git-bz";
···
     asciidoc docbook_xml_dtd_45 docbook_xsl libxslt makeWrapper xmlto
   ];
   buildInputs = []
-    ++ (with pythonPackages; [ python pysqlite ]);
+    ++ (with python2Packages; [ python pysqlite ]);
 
   postPatch = ''
     patchShebangs configure
···
 
   postInstall = ''
     wrapProgram $out/bin/git-bz \
-      --prefix PYTHONPATH : "$(toPythonPath "${pythonPackages.pycrypto}")" \
-      --prefix PYTHONPATH : "$(toPythonPath "${pythonPackages.pysqlite}")"
+      --prefix PYTHONPATH : "$(toPythonPath "${python2Packages.pycrypto}")" \
+      --prefix PYTHONPATH : "$(toPythonPath "${python2Packages.pysqlite}")"
   '';
 
   meta = with lib; {