tzdata: update to 2018c

The 2018c release of the tz code and data is available. It follows on the 2018a and 2018b releases, which were published but were not announced until now, due to problems discovered late in their release processes. 2018a had a build-failure typo, and 2018a and 2018b both had problems with ICU and Java, downstream packages which do not support a feature (negative DST offsets) used in 2018a and 2018b. The typo has been fixed, and data changes using negative DST offsets have been reverted pending development of a mechanism to export data to platforms lacking support for such data.

  Briefly:
  São Tomé and Príncipe switched from +00 to +01.
  Brazil's DST will now start on November's first Sunday.
  Use Debian-style installation locations, instead of 4.3BSD-style.
  New zic option -t.

  Changes to past and future time stamps

    São Tomé and Príncipe switched from +00 to +01 on 2018-01-01 at
    01:00.  (Thanks to Steffen Thorsen and Michael Deckers.)

  Changes to future time stamps

    Starting in 2018 southern Brazil will begin DST on November's
    first Sunday instead of October's third Sunday. (Thanks to
    Steffen Thorsen.)

  Changes to past time stamps

    Japanese DST transitions (1948-1951) were Sundays at 00:00, not
    Saturdays or Sundays at 02:00.  (Thanks to Takayuki Nikai.)

    A discrepancy of 4 s in timestamps before 1931 in South Sudan has
    been corrected.  The 'backzone' and 'zone.tab' files did not agree
    with the 'africa' and 'zone1970.tab' files.  (Problem reported by
    Michael Deckers.)

    The abbreviation invented for Bolivia Summer Time (1931-2) is now
    BST instead of BOST, to be more consistent with the convention
    used for Latvian Summer Time (1918-9) and for British Summer Time.

  Changes to build procedure

    The default installation locations have been changed to mostly
    match Debian circa 2017, instead of being designed as an add-on to
    4.3BSD circa 1986.  This affects the Makefile macros TOPDIR,
    TZDIR, MANDIR, and LIBDIR.  New Makefile macros TZDEFAULT, USRDIR,
    USRSHAREDIR, BINDIR, ZDUMPDIR, and ZICDIR let installers tailor
    locations more precisely.  (This responds to suggestions from
    Brian Inglis and from Steve Summit.)

    The default installation procedure no longer creates the
    backward-compatibility link US/Pacific-New, which causes
    confusion during user setup (e.g., see Debian bug 815200).
    Use 'make BACKWARD="backward pacificnew"' to create the link
    anyway, for now.  Eventually we plan to remove the link entirely.

    tzdata.zi now contains a version-number comment.
    (Suggested by Tom Lane.)

    The Makefile now quotes values like BACKWARD more carefully when
    passing them to the shell.  (Problem reported by Zefram.)

    Builders no longer need to specify -DHAVE_SNPRINTF on platforms
    that have snprintf and use pre-C99 compilers. (Problem reported
    by Jon Skeet.)

    The build procedure now works around mawk 1.3.3's lack of support
    for character class expressions.  (Problem reported by Ohyama.)

(From OE-Core rev: 40a3b937a5e88daa8fc4900796bca8b447084df5)

Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 97927956a6629381b54973d01e16c5f039f5e5bb)
Signed-off-by: Armin Kuster <akuster808@gmail.com>
(cherry picked from commit f266d17095441dd136c490578d7aae824ab16870)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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