Avoid platform-dependent output from Data::Dumper.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: e4300a3552b104f54ec781dd23cfcf96252ec5c1
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2018-06-18T18:53:21Z
Releases: 11.0
Avoid platform-dependent output from Data::Dumper.

Per buildfarm, the output from Data::Dumper for an IEEE infinity
is platform-dependent (e.g. "inf" vs "Inf").  Just skip that one
test case in the plperlu test; testing it on the plperl side is
coverage enough.  Fixes issue in commit 1731e3741.

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