pgsql: Sync timezone data with 2007e zic release.

Log Message:
-----------
Sync timezone data with 2007e zic release.

Modified Files:
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    pgsql/src/timezone/data:
        africa (r1.4 -> r1.5)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/timezone/data/africa.diff?r1=1.4&r2=1.5)
        asia (r1.6 -> r1.7)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/timezone/data/asia.diff?r1=1.6&r2=1.7)
        australasia (r1.4 -> r1.5)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/timezone/data/australasia.diff?r1=1.4&r2=1.5)
        backward (r1.4 -> r1.5)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/timezone/data/backward.diff?r1=1.4&r2=1.5)
        europe (r1.6 -> r1.7)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/timezone/data/europe.diff?r1=1.6&r2=1.7)
        iso3166.tab (r1.6 -> r1.7)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/timezone/data/iso3166.tab.diff?r1=1.6&r2=1.7)
        leapseconds (r1.5 -> r1.6)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/timezone/data/leapseconds.diff?r1=1.5&r2=1.6)
        northamerica (r1.6 -> r1.7)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/timezone/data/northamerica.diff?r1=1.6&r2=1.7)
        southamerica (r1.6 -> r1.7)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/timezone/data/southamerica.diff?r1=1.6&r2=1.7)
        zone.tab (r1.6 -> r1.7)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/timezone/data/zone.tab.diff?r1=1.6&r2=1.7)