pgsql: unaccent: mark unaccent() functions as immutable

unaccent: mark unaccent() functions as immutable

Suggestion from Pavel Stehule

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/9299f6179838cef8aa1123f6fb76f0d3d6f2decc

Modified Files
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contrib/unaccent/unaccent--1.0.sql | 4 ++--
contrib/unaccent/unaccent--unpackaged--1.0.sql | 6 +++---
2 files changed, 5 insertions(+), 5 deletions(-)

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