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/backup/dedup/default.nix

@@ -0,0 +1,34 @@
+{ lib, stdenv, fetchurl, lz4, snappy, libsodium
+# For testing
+, coreutils, gawk
+}:
+
+stdenv.mkDerivation rec {
+  pname = "dedup";
+  version = "2.0";
+
+  src = fetchurl {
+    url = "https://dl.2f30.org/releases/${pname}-${version}.tar.gz";
+    sha256 = "0n5kkni4d6blz3s94y0ddyhijb74lxv7msr2mvdmj8l19k0lrfh1";
+  };
+
+  makeFlags = [
+    "CC:=$(CC)"
+    "PREFIX=${placeholder "out"}"
+    "MANPREFIX=${placeholder "out"}/share/man"
+  ];
+
+  buildInputs = [ lz4 snappy libsodium ];
+
+  doCheck = true;
+
+  checkInputs = [ coreutils gawk ];
+  checkTarget = "test";
+
+  meta = with lib; {
+    description = "Data deduplication program";
+    homepage = "https://git.2f30.org/dedup/file/README.html";
+    license = with licenses; [ bsd0 isc ];
+    maintainers = with maintainers; [ dtzWill ];
+  };
+}