Ruby

forwardable.rb: fix for non-module objects

• lib/forwardable.rb (Forwardable._delegator_method): extract
  method generator and deal with non-module objects.
  [ruby-dev:49656] [Bug #12478]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55366 b2dd03c8-39d4-4d8f-98ff-823fe69b080e