Do not vendor cookbooks using Berkshelf anymore

Instead, use the Berkshelf support in knife-solo and the
vagrant-berkshelf plugin on Vagrant

cookbooks/ark/libraries/platform_specific_builders.rb

@@ -1,23 +0,0 @@
-module Ark
-  module PlatformSpecificBuilders
-    def generates_archive_commands_for(_name, options)
-      condition = options[:when_the]
-      builder = options[:with_klass]
-      archive_command_generators.push [condition, builder]
-    end
-
-    def archive_command_generators
-      @archive_command_generators ||= []
-    end
-
-    def generates_owner_commands_for(_name, options)
-      condition = options[:when_the]
-      builder = options[:with_klass]
-      owner_command_generators.push [condition, builder]
-    end
-
-    def owner_command_generators
-      @owner_command_generators ||= []
-    end
-  end
-end