Ruby » Ruby master

• thread_sync.c: reduce the specification of Queue#close.

  • Queue#close accepts no arguments.
  • deq'ing on closed queue returns nil, always.
    [Feature #10600]

• test/thread/test_queue.rb: catch up this fix.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52691 b2dd03c8-39d4-4d8f-98ff-823fe69b080e