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/openvpn_learnaddress.nix

@@ -0,0 +1,29 @@
+{ lib, stdenv, fetchgit, makeWrapper, coreutils, gawk, util-linux }:
+
+stdenv.mkDerivation {
+  pname = "openvpn-learnaddress";
+  version = "unstable-2013-10-21";
+
+  src = fetchgit {
+    url = "https://gist.github.com/4058733.git";
+    rev = "19b03c3beb0190df46ea07bf4b68244acb8eae80";
+    sha256 = "16pcyvyhwsx34i0cjkkx906lmrwdd9gvznvqdwlad4ha8l8f8z42";
+  };
+
+  nativeBuildInputs = [ makeWrapper ];
+  buildInputs = [ coreutils gawk util-linux ];
+
+  installPhase = ''
+    install -Dm555 ovpn-learnaddress $out/libexec/openvpn/openvpn-learnaddress
+
+    wrapProgram $out/libexec/openvpn/openvpn-learnaddress \
+        --prefix PATH : ${lib.makeBinPath [ coreutils gawk util-linux ]}
+  '';
+
+  meta = {
+    description = "Openvpn learn-address script to manage a hosts-like file";
+    homepage = "https://gist.github.com/offlinehacker/4058733/";
+    maintainers = [ lib.maintainers.offline ];
+    platforms = lib.platforms.unix;
+  };
+}