Sync zoneinfo database with tzdata2007h from elsie.

Sync zoneinfo database with tzdata2007h from elsie.

africa:         8.9  -> 8.10
asia:           8.11 -> 8.12
southamerica:   8.11 -> 8.12

From Paul Eggert's comments:

* Brazil will observe DST from 2007-10-14 00:00 to 2008-02-17 00:00.
  (Thanks to Steffen Thorsen for this.)

* Egypt switched earlier than we expected.  (Thanks to Dirk Losch
  and Jesper Norgaard Welen for this.)

* Likewise for Gaza.  (Thanks to Jesper Norgaard Welen for this.)

* Iran will resume DST next year.  (Thanks to Jesper Norgaard Welen
  for this.)

* Venezuela is currently planning to change time zones on January 1,
  to -04:30.  This seems to be a bit disorganized, but I suppose we
  can change the database later as needed.