[tz] Etc/GMT+nn and Etc/GMT-nn not working since zic 2021d

[Paul Eggert]

On 3/22/22 09:00, Ian Abbott via tz wrote:
> I guess this bug would affect all timezones that have no transitions?

More generally, the bug occurs if you use 'zic -r @T' with a timezone 
that lacks transitions before T. This means the truncated TZif file will 
be larger than an untruncated TZif file would be, because the truncated 
file needs to record the truncation timestamp in addition to all the 
other stuff. I'll look into patching the bug.