Suppress indentation from Data::Dumper in regression tests

Andrew Dunstan <andrew@dunslane.net>

Commit: 69db3b0cfccc0687dfbdf56afcfb2f8e536053c6
Author: Andrew Dunstan <andrew@dunslane.net>
Date: 2017-05-14T05:13:35Z
Releases: 9.6.4
Suppress indentation from Data::Dumper in regression tests

Ultra-modern versions of the perl Data::Dumper module have apparently
changed how they indent output. Instead of trying to keep up we choose
to tell it to supporess all indentation in the hstore_plperl regression
tests.

Backpatch to 9.5 where this feature was introduced.

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