Patch for broken pthread_key_delete.

[Ulrich Drepper]

Kaz Kylheku <kaz@ashi.footprints.net> writes:

> +	Bugfix to pthread_key_delete. It was iterating over the thread
> +	manager's linked list of threads, behind the thread manager's
> +	back causing a race. The fix is to have the manager iterate over
> +	the threads instead, using a new request type for doing so.

This looks better than I expected.  Thanks, I've applied the patch.

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