unaccent: Revert patch 9299f6179838cef8aa1123f6fb76f0d3d6f2decc

Bruce Momjian <bruce@momjian.us>

Commit: 0dbf9a6a91675b99a5097528729c38e7f3015646
Author: Bruce Momjian <bruce@momjian.us>
Date: 2013-11-18T20:54:34Z
Releases: 9.4.0
unaccent:  Revert patch 9299f6179838cef8aa1123f6fb76f0d3d6f2decc

The reverted patch to change functions from strict to immutable was
incorrect and needs additional research.

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