merge revision(s) r44681: [Backport #9440]
* ext/thread/thread.c (Init_thread): ConditionVariable and Queue are not able to copy. [ruby-core:59961] [Bug #9440]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@50044 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) r44681: [Backport #9440]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@50044 b2dd03c8-39d4-4d8f-98ff-823fe69b080e