nixpkgs: apparmor - remove dbus dependency

This was untested and didn't function without a dbus patch which wasn't
applied to the system dbus package, so it wasn't used at all.

Also, it creates a weird cyclic dependency if we want systemd to depend
on libapparmor (for AppArmorProfiles= support), because libapparmor then
wants dbus, and dbus wants systemd. Oof.

Luckily, this feature and whatnot will probably all be irrelevant in the
glorious kdbus-based future, and the dbus patches aren't even upstream I
think. So we can just drop it.

Signed-off-by: Austin Seipp <aseipp@pobox.com>

pkgs/os-specific/linux/apparmor/default.nix

@@ -1,5 +1,5 @@
 { stdenv, fetchurl, autoconf, automake, libtool, pkgconfig, perl, which
-, glibc, flex, bison, python27, swig, dbus, pam
+, glibc, flex, bison, python27, swig, pam
 }:
 
 let
@@ -36,7 +36,6 @@ let
       automake
       bison
       flex
-      dbus # requires patch to dbus ...
       glibc
       libtool
       perl