[tz] Add option to act like global-tz

[Paul Eggert]

I wangled a bit of free time and wrote the attached proposed patch, 
which adds an option that causes 'make install' to generate time zone 
data (TZif files) that are byte-for-byte identical to what Stephen 
Colebourne's global-tz currently generates. This is done via a few lines 
of awk script. The idea is to give an option to distros that prefer a 
separate Zone per ISO 3166 country, just as we already have build-time 
options for rearguard/vanguard form, TZif truncation, leap seconds, etc.

I haven't installed this in the development database. Comments welcome 
as usual.
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