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/compression/xdelta/default.nix

@@ -0,0 +1,62 @@
+{ lib, stdenv, fetchFromGitHub, autoreconfHook
+, lzmaSupport ? true, xz ? null
+}:
+
+assert lzmaSupport -> xz != null;
+
+let
+  mkWith = flag: name: if flag
+    then "--with-${name}"
+    else "--without-${name}";
+in stdenv.mkDerivation rec {
+  pname = "xdelta";
+  version = "3.1.0";
+
+  src = fetchFromGitHub {
+    sha256 = "09mmsalc7dwlvgrda56s2k927rpl3a5dzfa88aslkqcjnr790wjy";
+    rev = "v${version}";
+    repo = "xdelta-devel";
+    owner = "jmacd";
+  };
+
+  nativeBuildInputs = [ autoreconfHook ];
+  buildInputs = []
+    ++ lib.optionals lzmaSupport [ xz ];
+
+  postPatch = ''
+    cd xdelta3
+  '';
+
+  configureFlags = [
+    (mkWith lzmaSupport "liblzma")
+  ];
+
+  enableParallelBuilding = true;
+
+  doCheck = true;
+  checkPhase = ''
+    mkdir $PWD/tmp
+    for i in testing/file.h xdelta3-test.h; do
+      substituteInPlace $i --replace /tmp $PWD/tmp
+    done
+    ./xdelta3regtest
+  '';
+
+  installPhase = ''
+    install -D -m755 xdelta3 $out/bin/xdelta3
+    install -D -m644 xdelta3.1 $out/share/man/man1/xdelta3.1
+  '';
+
+  meta = with lib; {
+    description = "Binary differential compression in VCDIFF (RFC 3284) format";
+    longDescription = ''
+      xdelta is a command line program for delta encoding, which generates two
+      file differences. This is similar to diff and patch, but it is targeted
+      for binary files and does not generate human readable output.
+    '';
+    homepage = "http://xdelta.org/";
+    license = licenses.gpl2Plus;
+    mainProgram = "xdelta3";
+    platforms = platforms.unix;
+  };
+}