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/ldm/default.nix

@@ -0,0 +1,40 @@
+{ lib, stdenv, fetchgit, udev, util-linux, mountPath ? "/media/" }:
+
+assert mountPath != "";
+
+let
+  version = "0.5";
+in
+stdenv.mkDerivation rec {
+  pname = "ldm";
+  inherit version;
+
+  # There is a stable release, but we'll use the lvm branch, which
+  # contains important fixes for LVM setups.
+  src = fetchgit {
+    url = "https://github.com/LemonBoy/ldm";
+    rev = "refs/tags/v${version}";
+    sha256 = "0lxfypnbamfx6p9ar5k9wra20gvwn665l4pp2j4vsx4yi5q7rw2n";
+  };
+
+  buildInputs = [ udev util-linux ];
+
+  postPatch = ''
+    substituteInPlace ldm.c \
+      --replace "/mnt/" "${mountPath}"
+    sed '16i#include <sys/stat.h>' -i ldm.c
+  '';
+
+  buildFlags = [ "ldm" ];
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp -v ldm $out/bin
+  '';
+
+  meta = {
+    description = "A lightweight device mounter, with libudev as only dependency";
+    license = lib.licenses.mit;
+    platforms = lib.platforms.linux;
+  };
+}