Set client encoding to UTF8 for the citext regression script

Andrew Dunstan <andrew@dunslane.net>

Commit: 890faaf1957759c6e17fbcbfd16f7cabc4a59d07
Author: Andrew Dunstan <andrew@dunslane.net>
Date: 2017-09-19T18:51:51Z
Releases: 11.0
Set client encoding to UTF8 for the citext regression script

Problem introduced with non-ascii characters in commit f2464997644c
and discovered on various buildfarm animals.

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