[tz] need testing for new tzdb release for Brazil changes

[Paul Goyette]

On Mon, 27 May 2019, Brian Inglis wrote:

> Nothing has happened in the last 12 months, and recent advice in the bug report
> is still to use the rearguard workaround.

Is the current rearguard format expected to live "forever"?

Or, at some point in the future will we have a new vanguard format, and
all the other formats shift one position, with the current "vanguard"
format becoming "mainstream", the current "normal" becoming a new 
"mainstream" and the current "rearguard" being dropped off of the back 
end of the truck?



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