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/system/hiera-eyaml/Gemfile

@@ -0,0 +1,3 @@
+source 'https://rubygems.org'
+
+gem 'hiera-eyaml'

pkgs/tools/system/hiera-eyaml/Gemfile.lock

@@ -0,0 +1,17 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    hiera-eyaml (3.0.0)
+      highline (~> 1.6.19)
+      optimist
+    highline (1.6.21)
+    optimist (3.0.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  hiera-eyaml
+
+BUNDLED WITH
+   2.1.4

pkgs/tools/system/hiera-eyaml/default.nix

@@ -0,0 +1,17 @@
+{ lib, bundlerEnv, ruby, bundlerUpdateScript }:
+
+bundlerEnv {
+  inherit ruby;
+  pname = "hiera-eyaml";
+  gemdir = ./.;
+
+  passthru.updateScript = bundlerUpdateScript "hiera-eyaml";
+
+  meta = with lib; {
+    description = "Per-value asymmetric encryption of sensitive data for Hiera";
+    homepage = "https://github.com/TomPoulton/hiera-eyaml";
+    license = licenses.mit;
+    maintainers = with maintainers; [ benley nicknovitski ];
+    platforms = platforms.unix;
+  };
+}

pkgs/tools/system/hiera-eyaml/gemset.nix

@@ -0,0 +1,31 @@
+{
+  hiera-eyaml = {
+    dependencies = ["highline" "optimist"];
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "049rxnwyivqgyjl0sjg7cb2q44ic0wsml288caspd1ps8v31gl18";
+      type = "gem";
+    };
+    version = "3.0.0";
+  };
+  highline = {
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "06bml1fjsnrhd956wqq5k3w8cyd09rv1vixdpa3zzkl6xs72jdn1";
+      type = "gem";
+    };
+    version = "1.6.21";
+  };
+  optimist = {
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "05jxrp3nbn5iilc1k7ir90mfnwc5abc9h78s5rpm3qafwqxvcj4j";
+      type = "gem";
+    };
+    version = "3.0.0";
+  };
+}