[tz] [PROPOSED] Merge timezones that are alike since 1970

[Paul Eggert]

On 5/10/21 1:38 AM, Paul Eggert wrote:
> I'd like to do more tests before installing it into the development tzdb 
> repository on GitHub. Also, the patch needs a proper NEWS entry and 
> commit message before installing.

I did that and installed the attached revised patch into the development 
repository.

The second attachment 'adjustments.diff' attempts to records adjustments 
to this patch, compared to the patch I circulated ten days ago. 
'adjustments.diff' is hand-edited due to merges and so is intended only 
for human consumption.

The most significant adjustment was to add Link lines to 'backzone' so 
that people interested in out-of-scope pre-1970 data won't see any 
changes due to this patch. There are also some adjustments to commentary 
and a dependency fix in the Makefile.
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