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/batman-adv/default.nix

@@ -0,0 +1,38 @@
+{ lib
+, stdenv
+, fetchurl
+, fetchpatch
+, kernel
+}:
+
+let cfg = import ./version.nix; in
+
+stdenv.mkDerivation rec {
+  pname = "batman-adv";
+  version = "${cfg.version}-${kernel.version}";
+
+  src = fetchurl {
+    url = "http://downloads.open-mesh.org/batman/releases/${pname}-${cfg.version}/${pname}-${cfg.version}.tar.gz";
+    sha256 = cfg.sha256.${pname};
+  };
+
+  nativeBuildInputs = kernel.moduleBuildDependencies;
+  makeFlags = kernel.makeFlags ++ [
+    "KERNELPATH=${kernel.dev}/lib/modules/${kernel.modDirVersion}/build"
+  ];
+
+  hardeningDisable = [ "pic" ];
+
+  preBuild = ''
+    sed -i -e "s,INSTALL_MOD_DIR=,INSTALL_MOD_PATH=$out INSTALL_MOD_DIR=," \
+      -e /depmod/d Makefile
+  '';
+
+  meta = {
+    homepage = "https://www.open-mesh.org/projects/batman-adv/wiki/Wiki";
+    description = "B.A.T.M.A.N. routing protocol in a linux kernel module for layer 2";
+    license = lib.licenses.gpl2;
+    maintainers = with lib.maintainers; [ fpletz hexa ];
+    platforms = with lib.platforms; linux;
+  };
+}