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/tools/misc/ipad_charge/default.nix

@@ -0,0 +1,42 @@
+{ lib, stdenv, fetchFromGitHub, libusb1 }:
+
+stdenv.mkDerivation rec {
+  pname = "ipad_charge";
+  version = "2015-02-03";
+
+  src = fetchFromGitHub {
+    sha256 = "0f40hqx1dbqpwrhyf42h5982jwqv8j5zp5hwwakz6600hyqvnnz7";
+    rev = "bb24e1c3a79016cfdffb9d28189485766d655ec6";
+    repo = "ipad_charge";
+    owner = "mkorenkov";
+  };
+
+  buildInputs = [ libusb1 ];
+
+  postPatch = ''
+    substituteInPlace Makefile \
+      --replace " -o root -g root" "" \
+      --replace "/usr" "$out" \
+      --replace "/etc/udev" "$out/lib/udev"
+    substituteInPlace *.rules \
+      --replace "/usr" "$out"
+  '';
+
+  enableParallelBuilding = true;
+
+  preInstall = ''
+    mkdir -p $out/{bin,lib/udev/rules.d}
+  '';
+
+  meta = with lib; {
+    inherit (src.meta) homepage;
+    description = "Apple device USB charging utility for Linux";
+    longDescription = ''
+      USB charging control utility used to enable/disable charging of an Apple
+      device connected to USB port. For a list of supported devices, see
+      https://github.com/mkorenkov/ipad_charge#supported-devices.
+    '';
+    license = licenses.gpl2Plus;
+    platforms = platforms.linux;
+  };
+}