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/dupd/default.nix

@@ -0,0 +1,49 @@
+{ lib, stdenv, fetchFromGitHub, perl, which
+, openssl, sqlite }:
+
+# Instead of writing directly into $HOME, we change the default db location
+# from $HOME/.dupd_sqlite to $HOME/.cache/dupd.sqlite3
+
+stdenv.mkDerivation rec {
+  pname = "dupd";
+  version = "1.7.1";
+
+  src = fetchFromGitHub {
+    owner = "jvirkki";
+    repo  = "dupd";
+    rev   = version;
+    sha256 = "sha256-jDFPvJqIUEu0/8bvq2PaaA1NnWakApegW8bxn+NKffs=";
+  };
+
+  postPatch = ''
+    patchShebangs tests
+
+    # tests need HOME to write the database
+    export HOME=$TMPDIR
+
+    mkdir -p $HOME/.cache
+
+    for f in man/dupd man/dupd.1 src/main.c tests/test.56 tests/test.57 ; do
+      substituteInPlace $f --replace .dupd_sqlite .cache/dupd.sqlite3
+    done
+  '';
+
+  buildInputs = [ openssl sqlite ];
+
+  nativeBuildInputs = [ perl which ];
+
+  makeFlags = [
+    "INSTALL_PREFIX=$(out)"
+  ];
+
+  enableParallelBuilding = true;
+
+  doCheck = true;
+
+  meta = with lib; {
+    description = "CLI utility to find duplicate files";
+    homepage = "http://www.virkki.com/dupd";
+    license = licenses.gpl3;
+    maintainers = with maintainers; [ peterhoeg ];
+  };
+}