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/smokeping.nix

@@ -0,0 +1,34 @@
+import ./make-test-python.nix ({ pkgs, ...} : {
+  name = "smokeping";
+  meta = with pkgs.lib.maintainers; {
+    maintainers = [ cransom ];
+  };
+
+  nodes = {
+    sm =
+      { ... }:
+      {
+        networking.domain = "example.com"; # FQDN: sm.example.com
+        services.smokeping = {
+          enable = true;
+          port = 8081;
+          mailHost = "127.0.0.2";
+          probeConfig = ''
+            + FPing
+            binary = /run/wrappers/bin/fping
+            offset = 0%
+          '';
+        };
+      };
+  };
+
+  testScript = ''
+    start_all()
+    sm.wait_for_unit("smokeping")
+    sm.wait_for_unit("thttpd")
+    sm.wait_for_file("/var/lib/smokeping/data/Local/LocalMachine.rrd")
+    sm.succeed("curl -s -f localhost:8081/smokeping.fcgi?target=Local")
+    sm.succeed("ls /var/lib/smokeping/cache/Local/LocalMachine_mini.png")
+    sm.succeed("ls /var/lib/smokeping/cache/index.html")
+  '';
+})