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_0_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/3553d9c6ee3d97939be039c9f3022936d0fa339f

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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