pgsql: Update time zone data files to tzdata release 2015a.

Update time zone data files to tzdata release 2015a.

DST law changes in Chile and Mexico (state of Quintana Roo).
Historical changes for Iceland.

Branch
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REL9_2_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/c9048d353f1361642527d7fe31b6368237ca9079

Modified Files
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src/timezone/data/antarctica | 9 +++++----
src/timezone/data/asia | 28 ++++++++--------------------
src/timezone/data/backward | 2 +-
src/timezone/data/backzone | 24 +++++++++++++++++++++++-
src/timezone/data/europe | 29 +++++++++++++----------------
src/timezone/data/leapseconds | 4 ++++
src/timezone/data/northamerica | 27 +++++++++++++++++++++++----
src/timezone/data/southamerica | 17 ++++++++++++-----
src/timezone/data/zone.tab | 2 +-
src/timezone/data/zone1970.tab | 2 +-
src/timezone/known_abbrevs.txt | 4 ++--
src/timezone/tznames/America.txt | 7 +++----
src/timezone/tznames/Antarctica.txt | 4 ++--
src/timezone/tznames/Default | 7 +++----
14 files changed, 101 insertions(+), 65 deletions(-)

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