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/libraries/libnet/default.nix

@@ -0,0 +1,28 @@
+{ lib, stdenv, fetchFromGitHub, autoconf, automake, libtool }:
+
+stdenv.mkDerivation rec {
+  pname = "libnet";
+  version = "1.2";
+
+  src = fetchFromGitHub {
+    owner = "sam-github";
+    repo = "libnet";
+    rev = "v${version}";
+    sha256 = "sha256-Y/wd9c4whUbfpvWvKzJV6vJN3AlA14XBejchRG6wBc4=";
+  };
+
+  nativeBuildInputs = [
+    autoconf
+    automake
+    libtool
+  ];
+
+  preConfigure = "./autogen.sh";
+
+  meta = with lib; {
+    homepage = "https://github.com/sam-github/libnet";
+    description = "Portable framework for low-level network packet construction";
+    license = licenses.bsd3;
+    platforms = platforms.unix;
+  };
+}