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/haproxy.nix

@@ -0,0 +1,54 @@
+import ./make-test-python.nix ({ pkgs, ...}: {
+  name = "haproxy";
+  nodes = {
+    machine = { ... }: {
+      imports = [ ../modules/profiles/minimal.nix ];
+      services.haproxy = {
+        enable = true;
+        config = ''
+          defaults
+            timeout connect 10s
+
+          backend http_server
+            mode http
+            server httpd [::1]:8000
+
+          frontend http
+            bind *:80
+            mode http
+            http-request use-service prometheus-exporter if { path /metrics }
+            use_backend http_server
+        '';
+      };
+      services.httpd = {
+        enable = true;
+        virtualHosts.localhost = {
+          documentRoot = pkgs.writeTextDir "index.txt" "We are all good!";
+          adminAddr = "notme@yourhost.local";
+          listen = [{
+            ip = "::1";
+            port = 8000;
+          }];
+        };
+      };
+    };
+  };
+  testScript = ''
+    start_all()
+    machine.wait_for_unit("multi-user.target")
+    machine.wait_for_unit("haproxy.service")
+    machine.wait_for_unit("httpd.service")
+    assert "We are all good!" in machine.succeed("curl -fk http://localhost:80/index.txt")
+    assert "haproxy_process_pool_allocated_bytes" in machine.succeed(
+        "curl -fk http://localhost:80/metrics"
+    )
+
+    with subtest("reload"):
+        machine.succeed("systemctl reload haproxy")
+        # wait some time to ensure the following request hits the reloaded haproxy
+        machine.sleep(5)
+        assert "We are all good!" in machine.succeed(
+            "curl -fk http://localhost:80/index.txt"
+        )
+  '';
+})