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/snapcast.nix

@@ -0,0 +1,90 @@
+import ./make-test-python.nix ({ pkgs, ...} :
+
+let
+  port = 10004;
+  tcpPort = 10005;
+  httpPort = 10080;
+  tcpStreamPort = 10006;
+  bufferSize = 742;
+in {
+  name = "snapcast";
+  meta = with pkgs.lib.maintainers; {
+    maintainers = [ hexa ];
+  };
+
+  nodes = {
+    server = {
+      services.snapserver = {
+        enable = true;
+        port = port;
+        tcp.port = tcpPort;
+        http.port = httpPort;
+        openFirewall = true;
+        buffer = bufferSize;
+        streams = {
+          mpd = {
+            type = "pipe";
+            location = "/run/snapserver/mpd";
+            query.mode = "create";
+          };
+          bluetooth = {
+            type = "pipe";
+            location = "/run/snapserver/bluetooth";
+          };
+          tcp = {
+            type = "tcp";
+            location = "127.0.0.1:${toString tcpStreamPort}";
+          };
+          meta = {
+            type = "meta";
+            location = "/mpd/bluetooth/tcp";
+          };
+        };
+      };
+      environment.systemPackages = [ pkgs.snapcast ];
+    };
+    client = {
+      environment.systemPackages = [ pkgs.snapcast ];
+    };
+  };
+
+  testScript = ''
+    import json
+
+    get_rpc_version = {"id": "1", "jsonrpc": "2.0", "method": "Server.GetRPCVersion"}
+
+    start_all()
+
+    server.wait_for_unit("snapserver.service")
+    server.wait_until_succeeds("ss -ntl | grep -q ${toString port}")
+    server.wait_until_succeeds("ss -ntl | grep -q ${toString tcpPort}")
+    server.wait_until_succeeds("ss -ntl | grep -q ${toString httpPort}")
+    server.wait_until_succeeds("ss -ntl | grep -q ${toString tcpStreamPort}")
+
+    with subtest("check that pipes are created"):
+        server.succeed("test -p /run/snapserver/mpd")
+        server.succeed("test -p /run/snapserver/bluetooth")
+
+    with subtest("test tcp json-rpc"):
+        server.succeed(f"echo '{json.dumps(get_rpc_version)}' | nc -w 1 localhost ${toString tcpPort}")
+
+    with subtest("test http json-rpc"):
+        server.succeed(
+            "curl --fail http://localhost:${toString httpPort}/jsonrpc -d '{json.dumps(get_rpc_version)}'"
+        )
+
+    with subtest("test a ipv6 connection"):
+        server.execute("systemd-run --unit=snapcast-local-client snapclient -h ::1 -p ${toString port}")
+        server.wait_until_succeeds(
+            "journalctl -o cat -u snapserver.service | grep -q 'Hello from'"
+        )
+        server.wait_until_succeeds("journalctl -o cat -u snapcast-local-client | grep -q 'buffer: ${toString bufferSize}'")
+
+    with subtest("test a connection"):
+        client.execute("systemd-run --unit=snapcast-client snapclient -h server -p ${toString port}")
+        server.wait_until_succeeds(
+            "journalctl -o cat -u snapserver.service | grep -q 'Hello from'"
+        )
+        client.wait_until_succeeds("journalctl -o cat -u snapcast-client | grep -q 'buffer: ${toString bufferSize}'")
+  '';
+})