[tz] zone file format very strict

[Alois Treindl]

Hi

I noticed that the last line of a zone file like

# Zone  NAME            STDOFF  RULES FORMAT  [UNTIL]
Zone    Asia/Kabul      4:36:48 -       LMT     1890
                         4:00    -       +04     1945
                         4:30    -       +0430

does not suffer a trailing TAB character, behind the +0430

I think the zone file compiling mechanism could be a bit more tolerant 
of trailing white space.

The issue came about because I employ a zone file generator utility, 
which accidentally created
such trailing tabs in some cases.

I fixed my generator, but wanted to mention this anyway.

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