Missing require

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53361 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/tk/lib/remote-tk.rb

@@ -7,6 +7,8 @@ if defined? MultiTkIp
   fail RuntimeError, "'remote-tk' library must be required before requiring 'multi-tk'"
 end
 
+require 'tkutil'
+
 class MultiTkIp; end
 class RemoteTkIp < MultiTkIp; end