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/munin.nix

@@ -0,0 +1,44 @@
+# This test runs basic munin setup with node and cron job running on the same
+# machine.
+
+import ./make-test-python.nix ({ pkgs, ...} : {
+  name = "munin";
+  meta = with pkgs.lib.maintainers; {
+    maintainers = [ domenkozar eelco ];
+  };
+
+  nodes = {
+    one =
+      { config, ... }:
+        {
+          services = {
+            munin-node = {
+              enable = true;
+              # disable a failing plugin to prevent irrelevant error message, see #23049
+              disabledPlugins = [ "apc_nis" ];
+            };
+            munin-cron = {
+             enable = true;
+             hosts = ''
+               [${config.networking.hostName}]
+               address localhost
+             '';
+            };
+          };
+
+          # increase the systemd timer interval so it fires more often
+          systemd.timers.munin-cron.timerConfig.OnCalendar = pkgs.lib.mkForce "*:*:0/10";
+        };
+    };
+
+  testScript = ''
+    start_all()
+
+    with subtest("ensure munin-node starts and listens on 4949"):
+        one.wait_for_unit("munin-node.service")
+        one.wait_for_open_port(4949)
+    with subtest("ensure munin-cron output is correct"):
+        one.wait_for_file("/var/lib/munin/one/one-uptime-uptime-g.rrd")
+        one.wait_for_file("/var/www/munin/one/index.html")
+  '';
+})