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/mimir.nix

@@ -0,0 +1,50 @@
+import ./make-test-python.nix ({ pkgs, ... }: {
+  name = "mimir";
+  nodes = {
+    server = { ... }: {
+      environment.systemPackages = [ pkgs.jq ];
+      services.mimir.enable = true;
+      services.mimir.configuration = {
+        ingester.ring.replication_factor = 1;
+      };
+
+      services.telegraf.enable = true;
+      services.telegraf.extraConfig = {
+        agent.interval = "1s";
+        agent.flush_interval = "1s";
+        inputs.exec = {
+          commands = [
+            "${pkgs.coreutils}/bin/echo 'foo i=42i'"
+          ];
+          data_format = "influx";
+        };
+        outputs = {
+          http = {
+            # test remote write
+            url = "http://localhost:8080/api/v1/push";
+
+            # Data format to output.
+            data_format = "prometheusremotewrite";
+
+            headers = {
+              Content-Type = "application/x-protobuf";
+              Content-Encoding = "snappy";
+              X-Scope-OrgID = "nixos";
+              X-Prometheus-Remote-Write-Version = "0.1.0";
+            };
+          };
+        };
+      };
+    };
+  };
+
+  testScript = ''
+    start_all()
+    server.wait_for_unit("mimir.service")
+    server.wait_for_unit("telegraf.service")
+    server.wait_for_open_port(8080)
+    server.wait_until_succeeds(
+        "curl -H 'X-Scope-OrgID: nixos' http://127.0.0.1:8080/prometheus/api/v1/label/host/values | jq -r '.data[0]' | grep server"
+    )
+  '';
+})