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/amber/default.nix

@@ -0,0 +1,26 @@
+{ lib, stdenv, rustPlatform, fetchFromGitHub, Security }:
+
+rustPlatform.buildRustPackage rec {
+  # Renaming it to amber-secret because another package named amber exists
+  pname = "amber-secret";
+  version = "0.1.3";
+
+  src = fetchFromGitHub {
+    owner = "fpco";
+    repo = "amber";
+    rev = "v${version}";
+    sha256 = "sha256-kPDNTwsfI+8nOgsLv2aONrLGSRZhw5YzNntJ2tbE0oI=";
+  };
+
+  cargoSha256 = "sha256-fTdTgbeOQXEpLHq9tHiPLkttvaxS/WJ86h3jRdrfbJM=";
+
+  buildInputs = lib.optionals stdenv.isDarwin [ Security ];
+
+  meta = with lib; {
+    description = "Manage secret values in-repo via public key cryptography";
+    homepage = "https://github.com/fpco/amber";
+    license = licenses.mit;
+    maintainers = with maintainers; [ psibi ];
+    mainProgram = "amber";
+  };
+}