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/interpreters/ruby/dev.nix

@@ -0,0 +1,23 @@
+/* An environment for development that bundles ruby, bundler and bundix
+   together. This avoids version conflicts where each is using a diferent
+   version of each-other.
+*/
+{ buildEnv, ruby, bundler, bundix }:
+let
+  bundler_ = bundler.override {
+    ruby = ruby;
+  };
+  bundix_ = bundix.override {
+    bundler = bundler_;
+  };
+in
+buildEnv {
+  name = "${ruby.rubyEngine}-dev-${ruby.version}";
+  paths = [
+    bundix_
+    bundler_
+    ruby
+  ];
+  pathsToLink = [ "/bin" ];
+  ignoreCollisions = true;
+}