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/libmnl/default.nix

@@ -0,0 +1,26 @@
+{ lib, stdenv, fetchurl }:
+
+stdenv.mkDerivation rec {
+  pname = "libmnl";
+  version = "1.0.5";
+
+  src = fetchurl {
+    url = "https://netfilter.org/projects/libmnl/files/${pname}-${version}.tar.bz2";
+    sha256 = "09851ns07399rbz0y8slrlmnw3fn1nakr8d37pxjn5gkks8rnjr7";
+  };
+
+  meta = {
+    description = "Minimalistic user-space library oriented to Netlink developers";
+    longDescription = ''
+      libmnl is a minimalistic user-space library oriented to Netlink developers.
+      There are a lot of common tasks in parsing, validating, constructing of both the Netlink
+      header and TLVs that are repetitive and easy to get wrong.
+      This library aims to provide simple helpers that allows you to re-use code and to avoid
+      re-inventing the wheel.
+    '';
+    homepage = "https://netfilter.org/projects/libmnl/index.html";
+    license = lib.licenses.lgpl21Plus;
+
+    platforms = lib.platforms.linux;
+  };
+}