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/system/dd_rescue/default.nix

@@ -0,0 +1,40 @@
+{ lib, stdenv, fetchurl, autoconf }:
+
+stdenv.mkDerivation rec {
+  version = "1.99.8";
+  pname = "dd_rescue";
+
+  src = fetchurl {
+    sha256 = "1gbxm8gr9sx5g1q9dycs21hkxikcy97q09lp1lvs59pnd9qpdnwh";
+    url="http://www.garloff.de/kurt/linux/ddrescue/${pname}-${version}.tar.bz2";
+  };
+
+  dd_rhelp_src = fetchurl {
+    url = "http://www.kalysto.org/pkg/dd_rhelp-0.3.0.tar.gz";
+    sha256 = "0br6fs23ybmic3i5s1w4k4l8c2ph85ax94gfp2lzjpxbvl73cz1g";
+  };
+
+  buildInputs = [ autoconf ];
+
+  preBuild = ''
+    substituteInPlace Makefile \
+      --replace "\$(DESTDIR)/usr" "$out" \
+      --replace "-o root" "" \
+      --replace "-g root" ""
+  '';
+  makeFlags = [ "LIBDIR=$out" ];
+
+  postInstall = ''
+    mkdir -p "$out/share/dd_rescue" "$out/bin"
+    tar xf "${dd_rhelp_src}" -C "$out/share/dd_rescue"
+    cp "$out/share/dd_rescue"/dd_rhelp*/dd_rhelp "$out/bin"
+  '';
+
+  meta = with lib; {
+    description = "A tool to copy data from a damaged block device";
+    maintainers = with maintainers; [ raskin domenkozar ];
+    platforms = platforms.linux;
+    homepage = "http://www.garloff.de/kurt/linux/ddrescue/";
+    license = licenses.gpl2Plus;
+  };
+}