tzcode-native: updatet to 2018e

  Changes to build procedure

    The command 'make tarballs' now also builds the tarball
    tzdataVERSION-rearguard.tar.gz, which is like tzdataVERSION.tar.gz
    except that it uses rearguard format intended for trailing-edge
    data parsers.

  Changes to data format and to code

    The SAVE column of Rule and Zone lines can now have an 's' or 'd'
    suffix, which specifies whether the adjusted time is standard time
    or daylight saving time.  If no suffix is given, daylight saving
    time is used if and only if the SAVE column is nonzero; this is
    the longstanding behavior.  Although this new feature is not used
    in tzdata, it could be used to specify the legal time in Namibia
    1994-2017, as opposed to the popular time (see below).

  Changes to past time stamps

    From 1994 through 2017 Namibia observed DST in winter, not summer.
    That is, it used negative DST, as Ireland still does.  This change
    does not affect UTC offsets; it affects only the tm_isdst flag and
    the abbreviation used during summer, which is now CAT, not WAST.
    Although (as noted by Michael Deckers) summer and winter time were
    both simply called "standard time" in Namibian law, in common
    practice winter time was considered to be DST (as noted by Stephen
    Colebourne).  The full effect of this change is only in vanguard
    format; in rearguard and main format, the tm_isdst flag is still
    zero in winter and nonzero in summer.

    In 1946/7 Czechoslovakia also observed negative DST in winter.
    The full effect of this change is only in vanguard format; in
    rearguard and main formats, it is modeled as plain GMT without
    daylight saving.  Also, the dates of some 1944/5 DST transitions
    in Czechoslovakia have been changed.
(From OE-Core rev: aeb3d295581908ca9a9d8f1705f70b49b2de32e3)

Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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