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/servers/tang/default.nix

@@ -0,0 +1,32 @@
+{ lib, stdenv, fetchFromGitHub, autoreconfHook, pkg-config, asciidoc
+, jansson, jose, http-parser, systemd
+}:
+
+stdenv.mkDerivation rec {
+  pname = "tang";
+  version = "7";
+
+  src = fetchFromGitHub {
+    owner = "latchset";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "0y5w1jrq5djh9gpy2r98ja7676nfxss17s1dk7jvgblsijx9qsd7";
+  };
+
+  configureFlags = [
+    "--localstatedir=/var"
+    "--with-systemdsystemunitdir=${placeholder "out"}/lib/systemd/system"
+  ];
+
+  nativeBuildInputs = [ autoreconfHook pkg-config asciidoc ];
+  buildInputs = [ jansson jose http-parser systemd ];
+
+  outputs = [ "out" "man" ];
+
+  meta = {
+    description = "Server for binding data to network presence";
+    homepage = "https://github.com/latchset/tang";
+    maintainers = with lib.maintainers; [ fpletz ];
+    license = lib.licenses.gpl3Plus;
+  };
+}