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_4_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/c2b06ab177577d05655ec57239d9a7f2c6e7d9cf

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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