ext/thread: remove
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54827 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
ext/thread: remove
provides "thread.rb" already.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54827 b2dd03c8-39d4-4d8f-98ff-823fe69b080e