[tz] Gratuitous optimization

[Paul Eggert]

Thanks, I installed your performance fix via the attached proposed 
patch. The performance bug seems to have been introduced by my commit 
30364485a6fdc0333f48905db387e07abb70bac1 (2013-09-08) "Improve the 
support for perpetual DST" which first appeared in tzdb 2013e.
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