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/tools/networking/toxvpn/default.nix

@@ -0,0 +1,40 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, cmake
+, nlohmann_json
+, libtoxcore
+, libsodium
+, libcap
+, zeromq
+, systemd
+}:
+
+stdenv.mkDerivation {
+  pname = "toxvpn";
+  version = "unstable-2019-09-09";
+
+  src = fetchFromGitHub {
+    owner = "cleverca22";
+    repo = "toxvpn";
+    rev = "45083dec172ce167f7ed84d571ec2822ebe4d51a";
+    sha256 = "193crarrx6q0zd2p6dn67pzv8kngwi440zm1y54njgcz0v3fpxmb";
+  };
+
+  buildInputs = [ libtoxcore nlohmann_json libsodium zeromq ]
+    ++ lib.optionals stdenv.isLinux [ libcap systemd ];
+
+  nativeBuildInputs = [ cmake ];
+
+  cmakeFlags = lib.optional stdenv.isLinux [ "-DSYSTEMD=1" ];
+
+  postInstall = "$out/bin/toxvpn -h";
+
+  meta = with lib; {
+    description = "A powerful tool that allows one to make tunneled point to point connections over Tox";
+    homepage = "https://github.com/cleverca22/toxvpn";
+    license = licenses.gpl3;
+    maintainers = with maintainers; [ cleverca22 obadz toonn ];
+    platforms = platforms.unix;
+  };
+}