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/development/tools/build-managers/drake/Gemfile

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

pkgs/development/tools/build-managers/drake/Gemfile.lock

@@ -0,0 +1,15 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    comp_tree (1.1.3)
+    drake (0.9.2.0.3.1)
+      comp_tree (>= 1.1.3)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  drake
+
+BUNDLED WITH
+   2.1.4

pkgs/development/tools/build-managers/drake/default.nix

@@ -0,0 +1,17 @@
+{ lib, bundlerApp, bundlerUpdateScript }:
+
+bundlerApp {
+  pname = "drake";
+  gemdir = ./.;
+  exes = [ "drake" ];
+
+  passthru.updateScript = bundlerUpdateScript "drake";
+
+  meta = with lib; {
+    description = "A branch of Rake supporting automatic parallelizing of tasks";
+    homepage = "http://quix.github.io/rake/";
+    maintainers = with maintainers; [ romildo manveru nicknovitski ];
+    license = licenses.mit;
+    platforms = platforms.unix;
+  };
+}

pkgs/development/tools/build-managers/drake/gemset.nix

@@ -0,0 +1,23 @@
+{
+  comp_tree = {
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "0dj9lkfxcczn67l1j12dcxswrfxxd1zgxa344zk6vqs2gwwhy9m9";
+      type = "gem";
+    };
+    version = "1.1.3";
+  };
+  drake = {
+    dependencies = ["comp_tree"];
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "09gkmdshwdmdnkdxi03dv4rk1dip0wdv6dx14wscrmi0jyk86yag";
+      type = "gem";
+    };
+    version = "0.9.2.0.3.1";
+  };
+}