[tz] Mongolia

[Paul Eggert]

Thanks for that analysis of our conflicting data about Mongolia. On 
balance I'm inclined to agree with you that part of our 2008 change that 
was at the time marked "this is almost surely wrong" is best reverted, 
and installed the attached patch which incorporates your analysis and 
takes your first proposed solution, which is simpler. I had one quibble, 
though:

On 6/24/24 00:03, Heitor David Pinto via tz wrote:
> It also matches a Mongolian news article about the election in 2017:
> https://mongolia.gogo.mn/r/806d6  

That news article doesn't cast light on the matter, because when it was 
written the polls would have been closed in the central and eastern 
regions of Mongolia regardless of whether Mongolia had two time zones or 
three. So I omitted that citation in the commentary of the attached 
proposed patch, which I installed in the development repository.
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