Remove top-level dbus_python and pythonDBus.

See #11567.

Furthermore, it renames pythonPackages.dbus to pythonPackages.dbus-
python as that's the name upstream uses.

There is a small rebuild but I couldn't figure out the actual cause.

pkgs/misc/jackaudio/default.nix

@@ -1,8 +1,8 @@
-{ stdenv, fetchFromGitHub, pkgconfig, python, makeWrapper
+{ stdenv, fetchFromGitHub, pkgconfig, pythonPackages, makeWrapper
 , bash, libsamplerate, libsndfile, readline, gcc
 
 # Optional Dependencies
-, dbus ? null, pythonDBus ? null, libffado ? null, alsaLib ? null
+, dbus ? null, libffado ? null, alsaLib ? null
 , libopus ? null
 
 # Extra options
@@ -11,12 +11,13 @@
 
 with stdenv.lib;
 let
+  inherit (pythonPackages) python dbus-python;
   shouldUsePkg = pkg: if pkg != null && stdenv.lib.any (x: x == stdenv.system) pkg.meta.platforms then pkg else null;
 
   libOnly = prefix == "lib";
 
   optDbus = shouldUsePkg dbus;
-  optPythonDBus = if libOnly then null else shouldUsePkg pythonDBus;
+  optPythonDBus = if libOnly then null else shouldUsePkg dbus-python;
   optLibffado = if libOnly then null else shouldUsePkg libffado;
   optAlsaLib = if libOnly then null else shouldUsePkg alsaLib;
   optLibopus = shouldUsePkg libopus;