uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

nixos/modules/services/x11/display-managers/slim.nix

@@ -0,0 +1,16 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+{
+  # added 2019-11-11
+  imports = [
+    (mkRemovedOptionModule [ "services" "xserver" "displayManager" "slim" ] ''
+      The SLIM project is abandoned and their last release was in 2013.
+      Because of this it poses a security risk to your system.
+      Other issues include it not fully supporting systemd and logind sessions.
+      Please use a different display manager such as LightDM, SDDM, or GDM.
+      You can also use the startx module which uses Xinitrc.
+    '')
+  ];
+}