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/tests/cage.nix

@@ -0,0 +1,36 @@
+import ./make-test-python.nix ({ pkgs, ...} :
+
+{
+  name = "cage";
+  meta = with pkgs.lib.maintainers; {
+    maintainers = [ matthewbauer ];
+  };
+
+  nodes.machine = { ... }:
+
+  {
+    imports = [ ./common/user-account.nix ];
+    services.cage = {
+      enable = true;
+      user = "alice";
+      # Disable color and bold and use a larger font to make OCR easier:
+      program = "${pkgs.xterm}/bin/xterm -cm -pc -fa Monospace -fs 24";
+    };
+
+    # Need to switch to a different GPU driver than the default one (-vga std) so that Cage can launch:
+    virtualisation.qemu.options = [ "-vga none -device virtio-gpu-pci" ];
+  };
+
+  enableOCR = true;
+
+  testScript = { nodes, ... }: let
+    user = nodes.machine.config.users.users.alice;
+  in ''
+    with subtest("Wait for cage to boot up"):
+        start_all()
+        machine.wait_for_file("/run/user/${toString user.uid}/wayland-0.lock")
+        machine.wait_until_succeeds("pgrep xterm")
+        machine.wait_for_text("alice@machine")
+        machine.screenshot("screen")
+  '';
+})