Extension to tzcode to support additional timezones

[Tony Finch]

On Tue, 26 Oct 2010, Christos Zoulas wrote:
>
> 	- use c99 __thread (does not work everywhere)

There is no such thing. C99 has no thread support. C1x will have thread
support but it has nothing called __thread. It does have a _Thread_local
storage class.

Tony.
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