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/security/enchive/default.nix

@@ -0,0 +1,27 @@
+{ lib, stdenv, fetchFromGitHub }:
+
+stdenv.mkDerivation rec {
+  pname = "enchive";
+  version = "3.5";
+  src = fetchFromGitHub {
+    owner = "skeeto";
+    repo = "enchive";
+    rev = version;
+    sha256 = "0fdrfc5l42lj2bvmv9dmkmhmm7qiszwk7cmdvnqad3fs7652g0qa";
+  };
+
+  makeFlags = ["PREFIX=$(out)"];
+
+  postInstall = ''
+    mkdir -p $out/share/emacs/site-lisp/
+    cp -v "$src/enchive-mode.el" "$out/share/emacs/site-lisp/"
+  '';
+
+  meta = {
+    description = "Encrypted personal archives";
+    homepage = "https://github.com/skeeto/enchive";
+    license = lib.licenses.unlicense;
+    platforms = lib.platforms.unix;
+    maintainers = [ lib.maintainers.nico202 ];
+  };
+}