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>

pkgs/development/ocaml-modules/dns/tsig.nix

@@ -0,0 +1,22 @@
+{ buildDunePackage, dns, mirage-crypto, base64, alcotest }:
+
+buildDunePackage {
+  pname = "dns-tsig";
+
+  inherit (dns) version src useDune2 minimumOCamlVersion;
+
+  propagatedBuildInputs = [
+    mirage-crypto
+    dns
+    base64
+  ];
+
+  doCheck = true;
+  checkInputs = [
+    alcotest
+  ];
+
+  meta = dns.meta // {
+    description = "TSIG support for DNS";
+  };
+}