[tz] US Sep 30, 1945

[Paul Eggert]

Ken Murchison wrote:
> when converting the TZ data into iCalendar VTIMEZONEs with vzic, the dst->std
> transition for 1945 doesn't get coalesced into the recurrence rule for 1946-1954.

That sounds like a good-enough reason to change it.  zic doesn't care, I expect. 
  Proposed patch attached.
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