unaccent: mark unaccent() functions as immutable

Bruce Momjian <bruce@momjian.us>

Commit: 9299f6179838cef8aa1123f6fb76f0d3d6f2decc
Author: Bruce Momjian <bruce@momjian.us>
Date: 2013-10-08T16:20:36Z
Releases: 9.4.0
unaccent:  mark unaccent() functions as immutable

Suggestion from Pavel Stehule

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