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/os-specific/linux/openvswitch/default.nix

@@ -0,0 +1,65 @@
+{ lib, stdenv, fetchurl, makeWrapper, pkg-config, util-linux, which
+, procps, libcap_ng, openssl, python3 , perl
+, kernel ? null }:
+
+with lib;
+
+let
+  _kernel = kernel;
+  pythonEnv = python3.withPackages (ps: with ps; [ six ]);
+in stdenv.mkDerivation rec {
+  version = "2.17.0";
+  pname = "openvswitch";
+
+  src = fetchurl {
+    url = "https://www.openvswitch.org/releases/${pname}-${version}.tar.gz";
+    sha256 = "sha256-4Dv6t8qC2Bp9OjbeTzkKO1IQ4/OWV2cfkih3zU6m3HM=";
+  };
+
+  kernel = optional (_kernel != null) _kernel.dev;
+
+  nativeBuildInputs = [ pkg-config makeWrapper ];
+  buildInputs = [ util-linux openssl libcap_ng pythonEnv
+                  perl procps which ];
+
+  configureFlags = [
+    "--localstatedir=/var"
+    "--sharedstatedir=/var"
+    "--sbindir=$(out)/bin"
+  ] ++ (optionals (_kernel != null) ["--with-linux"]);
+
+  # Leave /var out of this!
+  installFlags = [
+    "LOGDIR=$(TMPDIR)/dummy"
+    "RUNDIR=$(TMPDIR)/dummy"
+    "PKIDIR=$(TMPDIR)/dummy"
+  ];
+
+  postBuild = ''
+    # fix tests
+    substituteInPlace xenserver/opt_xensource_libexec_interface-reconfigure --replace '/usr/bin/env python' '${pythonEnv.interpreter}'
+    substituteInPlace vtep/ovs-vtep --replace '/usr/bin/env python' '${pythonEnv.interpreter}'
+  '';
+
+  enableParallelBuilding = true;
+  doCheck = false; # bash-completion test fails with "compgen: command not found"
+
+  meta = with lib; {
+    platforms = platforms.linux;
+    description = "A multilayer virtual switch";
+    longDescription =
+      ''
+      Open vSwitch is a production quality, multilayer virtual switch
+      licensed under the open source Apache 2.0 license. It is
+      designed to enable massive network automation through
+      programmatic extension, while still supporting standard
+      management interfaces and protocols (e.g. NetFlow, sFlow, SPAN,
+      RSPAN, CLI, LACP, 802.1ag). In addition, it is designed to
+      support distribution across multiple physical servers similar
+      to VMware's vNetwork distributed vswitch or Cisco's Nexus 1000V.
+      '';
+    homepage = "https://www.openvswitch.org/";
+    license = licenses.asl20;
+    maintainers = with maintainers; [ netixx kmcopper ];
+  };
+}