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/openvpn/update-systemd-resolved.nix

@@ -0,0 +1,42 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, iproute2
+, runtimeShell
+, systemd
+, coreutils
+, util-linux
+}:
+
+stdenv.mkDerivation rec {
+  pname = "update-systemd-resolved";
+  # when updating this, check if additional binaries need injecting into PATH
+  version = "1.3.0";
+
+  src = fetchFromGitHub {
+    owner = "jonathanio";
+    repo = "update-systemd-resolved";
+    rev = "v${version}";
+    hash = "sha256-lYJTR3oBmpENcqNHa9PFXsw7ly6agwjBWf4UXf1d8Kc=";
+  };
+
+  # set SCRIPT_NAME in case we are wrapped and inject PATH
+  patches = [
+    ./update-systemd-resolved.patch
+  ];
+
+  PREFIX = "${placeholder "out"}/libexec/openvpn";
+
+  postInstall = ''
+    substituteInPlace ${PREFIX}/update-systemd-resolved \
+      --subst-var-by PATH ${lib.makeBinPath [ coreutils iproute2 runtimeShell systemd util-linux ]}
+  '';
+
+  meta = with lib; {
+    description = "Helper script for OpenVPN to directly update the DNS settings of a link through systemd-resolved via DBus";
+    homepage = "https://github.com/jonathanio/update-systemd-resolved";
+    license = licenses.gpl3Only;
+    maintainers = with maintainers; [ eadwu ];
+    platforms = platforms.linux;
+  };
+}