hash value.

* lib/tsort.rb (TSort#each_strongly_connected_component): don't use
  block argument.
  (each_strongly_connected_component_from): ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@3710 b2dd03c8-39d4-4d8f-98ff-823fe69b080e