[tz] 'date -u' should say "UTC", not "GMT"

[Clive D.W. Feather]

Paul Eggert said:
>> UTC, yes.  UT?
> UT a.k.a. Universal Time" is deliberately ambiguous: it refers to all 
> the UTx variants together.

Are you sure of that? It has always been my understanding that UT refers to
either UT0 or UT1, but *never* UTC.

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Clive D.W. Feather          | If you lie to the compiler,
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