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/lvmsync/default.nix

@@ -0,0 +1,34 @@
+{ lib, stdenv, bundlerEnv, ruby, bundlerUpdateScript, makeWrapper }:
+
+stdenv.mkDerivation rec {
+  pname = "lvmsync";
+  version = (import ./gemset.nix).${pname}.version;
+
+  buildInputs = [ makeWrapper ];
+
+  dontUnpack = true;
+
+  installPhase = let
+    env = bundlerEnv {
+      name = "${pname}-${version}-gems";
+      ruby = ruby;
+      gemfile  = ./Gemfile;
+      lockfile = ./Gemfile.lock;
+      gemset   = ./gemset.nix;
+    };
+  in ''
+    mkdir -p $out/bin
+    makeWrapper ${env}/bin/lvmsync $out/bin/lvmsync
+  '';
+
+  passthru.updateScript = bundlerUpdateScript "lvmsync";
+
+  meta = with lib; {
+    description = "Optimised synchronisation of LVM snapshots over a network";
+    homepage = "https://theshed.hezmatt.org/lvmsync/";
+    license = licenses.gpl3;
+    platforms = platforms.all;
+    maintainers = with maintainers; [ jluttine nicknovitski ];
+  };
+
+}