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/rufo/Gemfile

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

pkgs/development/tools/rufo/Gemfile.lock

@@ -0,0 +1,13 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    rufo (0.12.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  rufo
+
+BUNDLED WITH
+   2.1.4

pkgs/development/tools/rufo/default.nix

@@ -0,0 +1,16 @@
+{ bundlerApp, bundlerUpdateScript, lib }:
+
+bundlerApp {
+  pname = "rufo";
+  gemdir = ./.;
+  exes = [ "rufo" ];
+
+  passthru.updateScript = bundlerUpdateScript "rufo";
+
+  meta = with lib; {
+    description = "Ruby formatter";
+    homepage = "https://github.com/ruby-formatter/rufo";
+    license = licenses.mit;
+    maintainers = with maintainers; [ andersk ];
+  };
+}

pkgs/development/tools/rufo/gemset.nix

@@ -0,0 +1,12 @@
+{
+  rufo = {
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "0nwasskcm0nrf7f52019x4fvxa5zckj4fcvf4cdl0qflrcwb1l9f";
+      type = "gem";
+    };
+    version = "0.12.0";
+  };
+}