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/telegraf.nix

@@ -0,0 +1,33 @@
+import ./make-test-python.nix ({ pkgs, ...} : {
+  name = "telegraf";
+  meta = with pkgs.lib.maintainers; {
+    maintainers = [ mic92 ];
+  };
+
+  nodes.machine = { ... }: {
+    services.telegraf.enable = true;
+    services.telegraf.environmentFiles = [(pkgs.writeText "secrets" ''
+      SECRET=example
+    '')];
+    services.telegraf.extraConfig = {
+      agent.interval = "1s";
+      agent.flush_interval = "1s";
+      inputs.exec = {
+        commands = [
+          "${pkgs.runtimeShell} -c 'echo $SECRET,tag=a i=42i'"
+        ];
+        timeout = "5s";
+        data_format = "influx";
+      };
+      outputs.file.files = ["/tmp/metrics.out"];
+      outputs.file.data_format = "influx";
+    };
+  };
+
+  testScript = ''
+    start_all()
+
+    machine.wait_for_unit("telegraf.service")
+    machine.wait_until_succeeds("grep -q example /tmp/metrics.out")
+  '';
+})