pgsql: Update time zone data files to tzdata release 2018g.

Update time zone data files to tzdata release 2018g.

DST law changes in Morocco (with, effectively, zero notice).
Historical corrections for Hawaii.

Branch
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REL9_4_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/d651e9e7c585a4e10566fa1e0d96497e0f630115

Modified Files
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src/timezone/data/tzdata.zi | 82 +++++++++++++++++++++------------------------
1 file changed, 39 insertions(+), 43 deletions(-)