Thread: pgsql: Use a fatal warning check with what looks like a more portable

Log Message:
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Use a fatal warning check with what looks like a more portable error message. Error noticed by Tom and buildfarm member
kite.

Modified Files:
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    pgsql/src/pl/plperl/expected:
        plperl.out (r1.19 -> r1.20)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/pl/plperl/expected/plperl.out?r1=1.19&r2=1.20)
    pgsql/src/pl/plperl/sql:
        plperl.sql (r1.17 -> r1.18)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/pl/plperl/sql/plperl.sql?r1=1.17&r2=1.18)