Ruby

Queue, SizedQueue, and ConditionVariable internal implementation
should not be tied to using arrays. Implementation details can
change and I am working on a change to remove the dependency on
arrays (as others may attempt, too) by using ccan/list for the
waiter list.

• test/thread/test_cv.rb (test_dump): remove check for Array
• test/thread/test_queue.rb (test_dump): ditto

I have no idea if my work-in-progress change to use ccan/list
will be acceptable; regardless, I do not believe we should be
testing for this implementation detail. Will commit in a few
days if no objections.