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/ipvsadm/default.nix

@@ -0,0 +1,41 @@
+{ lib, stdenv, fetchurl, pkg-config, libnl, popt, gnugrep }:
+
+stdenv.mkDerivation rec {
+  pname = "ipvsadm";
+  version = "1.31";
+
+  src = fetchurl {
+    url = "mirror://kernel/linux/utils/kernel/ipvsadm/${pname}-${version}.tar.xz";
+    sha256 = "1nyzpv1hx75k9lh0vfxfhc0p2fpqaqb38xpvs8sn88m1nljmw2hs";
+  };
+
+  postPatch = ''
+    substituteInPlace Makefile --replace "-lnl" "$(pkg-config --libs libnl-genl-3.0)"
+  '';
+
+  nativeBuildInputs = [ pkg-config ];
+  buildInputs = [ libnl popt ];
+
+  # Disable parallel build, errors:
+  #  *** No rule to make target 'libipvs/libipvs.a', needed by 'ipvsadm'.  Stop.
+  enableParallelBuilding = false;
+
+  preBuild = ''
+    makeFlagsArray+=(
+      INCLUDE=$(pkg-config --cflags libnl-genl-3.0)
+      BUILD_ROOT=$out
+      MANDIR=share/man
+    )
+  '';
+
+  postInstall = ''
+    sed -i -e "s|^PATH=.*|PATH=$out/bin:${gnugrep}/bin|" $out/sbin/ipvsadm-{restore,save}
+  '';
+
+  meta = with lib; {
+    description = "Linux Virtual Server support programs";
+    homepage = "http://www.linuxvirtualserver.org/software/ipvs.html";
+    license = licenses.gpl2;
+    platforms = platforms.linux;
+  };
+}