bug#21020: 24.4; `display-time-world' tampers with TZ

[Paul Eggert]

Eli Zaretskii wrote:

> I hope we have some
> tests to make sure this doesn't cause any regressions.

test/automated/icalender-tests.el exercises the new code.

> Other than that, please make in nt/gnulib.mk the same changes you did
> in lib/gnulib.mk, otherwise I think the changes will not compile on
> Windows.

OK, done in the revised patch (attached).  Also, the MS-Windows port can't 
entirely skip the time module any more, as that module arranges for time.h to 
declare localtime_rz and friends.  I guess one possibility is to have 
nt/gnulib.mk mimic lib/gnulib.mk as far as the time module goes; this is also 
done in the revised patch.

0001-New-optional-ZONE-arg-for-format-time-string-etc.patch
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