Avoid duplicate rules in QWinTimeZonePrivate::init()

It was iterating the full range of years, adding a rule for each year.
The rules have a startYear member and are used for later years until
the next rule's startYear, so we don't need to duplicate them; and the
system APIs we get them from do support recurrent rules (with wYear
set to 0), that apply to ranges of years.  So propagate that
recurrence and reuse rules where we can.

Change-Id: Ifdd292d3f3d3e07969d7a02bb01f2a0110d32950
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

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