Suppress indentation from Data::Dumper in regression tests

Andrew Dunstan <andrew@dunslane.net>

Commit: b3c8630f11445692fd149d3c9bdab65ffd586a3a
Author: Andrew Dunstan <andrew@dunslane.net>
Date: 2017-05-14T05:32:54Z
Releases: 9.5.8
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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