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/zsteg/Gemfile

@@ -0,0 +1,2 @@
+source 'https://rubygems.org'
+gem 'zsteg'

pkgs/tools/security/zsteg/Gemfile.lock

@@ -0,0 +1,19 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    iostruct (0.0.4)
+    rainbow (3.0.0)
+    zpng (0.3.1)
+      rainbow
+    zsteg (0.2.2)
+      iostruct
+      zpng (>= 0.3.1)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  zsteg
+
+BUNDLED WITH
+   2.1.4

pkgs/tools/security/zsteg/default.nix

@@ -0,0 +1,16 @@
+{ lib, bundlerApp }:
+
+bundlerApp {
+  pname = "zsteg";
+
+  gemdir = ./.;
+
+  exes = [ "zsteg" ];
+
+  meta = with lib; {
+    description = "Detect stegano-hidden data in PNG & BMP.";
+    homepage = "http://zed.0xff.me/";
+    license = licenses.mit;
+    maintainers = with maintainers; [ applePrincess ];
+  };
+}

pkgs/tools/security/zsteg/gemset.nix

@@ -0,0 +1,44 @@
+{
+  iostruct = {
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "0kwp6ryis32j3z7myw8g7v1yszwrwyl04g2c7flr42pwxga1afxc";
+      type = "gem";
+    };
+    version = "0.0.4";
+  };
+  rainbow = {
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "0bb2fpjspydr6x0s8pn1pqkzmxszvkfapv0p4627mywl7ky4zkhk";
+      type = "gem";
+    };
+    version = "3.0.0";
+  };
+  zpng = {
+    dependencies = ["rainbow"];
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "0ciyab7qxqsxjhfvr6rbpdzg655fi1zygqg9sd9m6wmgc037dj74";
+      type = "gem";
+    };
+    version = "0.3.1";
+  };
+  zsteg = {
+    dependencies = ["iostruct" "zpng"];
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "1mwajlsgs27449n2yf2f9hz8g46qv9bz9f58i9cz1jg58spvpxpk";
+      type = "gem";
+    };
+    version = "0.2.2";
+  };
+}