tzdata: update to 2018g

  Changes to code

    When generating TZif files with leap seconds, zic no longer uses a
    format that trips up older 32-bit clients, fixing a bug introduced
    in 2018f.  (Reported by Daniel Fischer.)  Also, the zic workaround
    for QTBUG-53071 now also works for TZif files with leap seconds.

    The translator to rearguard format now rewrites the line
    "Rule Japan 1948 1951 - Sep Sat>=8 25:00 0 S" to
    "Rule Japan 1948 1951 - Sep Sun>=9  1:00 0 S".
    This caters to zic before 2007 and to Oracle TZUpdater 2.2.0
    and earlier.  (Reported by Christos Zoulas.)

  Changes to past time zone abbreviations

    Change HDT to HWT/HPT for WWII-era abbreviations in Hawaii.
    This reverts to 2011h, as the abbreviation change in 2011i was
    likely inadvertent.

  Changes to documentation

    tzfile.5 has new sections on interoperability issues.

Signed-off-by: Armin Kuster <akuster808@gmail.com>

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