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/radvd/default.nix

@@ -0,0 +1,27 @@
+{ lib, stdenv, fetchurl, pkg-config, libdaemon, bison, flex, check }:
+
+stdenv.mkDerivation rec {
+  pname = "radvd";
+  version = "2.19";
+
+  src = fetchurl {
+    url = "http://www.litech.org/radvd/dist/${pname}-${version}.tar.xz";
+    sha256 = "0h722f17h7cra1sjgrxhrrvx54mm47fs039909yhbabigxch8kjn";
+  };
+
+  nativeBuildInputs = [ pkg-config bison flex check ];
+  buildInputs = [ libdaemon ];
+
+  # Needed for cross-compilation
+  makeFlags = [
+    "AR=${stdenv.cc.targetPrefix}ar"
+  ];
+
+  meta = with lib; {
+    homepage = "http://www.litech.org/radvd/";
+    description = "IPv6 Router Advertisement Daemon";
+    platforms = platforms.linux;
+    license = licenses.bsdOriginal;
+    maintainers = with maintainers; [ fpletz ];
+  };
+}