[tz] Buggy %z behaviour in strftime

[Paul Eggert]

On 7/18/22 15:19, Steffen Nurpmeso wrote:
>    https://austingroupbugs.net/view.php?id=1533

Thanks for the URL. In looking at that I see one way in which tzcode 
doesn't conform to the draft POSIX spec: its gmtime generates the 
abbreviation "GMT" whereas draft POSIX requires it to generate the 
more-modern "UTC". Proposed patch 0001 attached.

Also, while writing the above patch I noticed that 'make install' 
defaults LOCALTIME to GMT. In the spirit of being more like POSIX, let's 
change the LOCALTIME default back to Factory. That's the way it used to 
be. Although we changed it from Factory to GMT in 2010 due to issues 
with the length of the old Factory abbreviation, these issues were fixed 
in 2016 so we don't need to worry about them any more. Proposed patches 
0002 and 0003 attached.
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