Remove jsonb_plperl test cases for Inf/NaN conversions.

It turns out that old Perl versions (before about 5.10) don't have any
very reliable way to generate Inf or NaN numeric values.  Getting around
that would require way more work than is really justified to test the
code involved, so let's just drop these new test cases.

Discussion: https://postgr.es/m/28585.1525131438@sss.pgh.pa.us

contrib/jsonb_plperl/expected/jsonb_plperl.out

@@ -39,26 +39,6 @@ SELECT testSVToJsonb();
  1
 (1 row)
 
-CREATE FUNCTION testInf() RETURNS jsonb
-LANGUAGE plperl
-TRANSFORM FOR TYPE jsonb
-AS $$
-$val = 9**9**9;  # we assume this will overflow to +Inf
-return $val;
-$$;
-SELECT testInf();
-ERROR:  cannot convert infinity to jsonb
-CONTEXT:  PL/Perl function "testinf"
-CREATE FUNCTION testNaN() RETURNS jsonb
-LANGUAGE plperl
-TRANSFORM FOR TYPE jsonb
-AS $$
-$val = sin(9**9**9);  # we assume sin(inf) will yield NaN
-return $val;
-$$;
-SELECT testNaN();
-ERROR:  cannot convert NaN to jsonb
-CONTEXT:  PL/Perl function "testnan"
 -- this revealed a bug in the original implementation
 CREATE FUNCTION testRegexpResultToJsonb() RETURNS jsonb
 LANGUAGE plperl
@@ -227,4 +207,4 @@ SELECT roundtrip('{"1": {"2": [3, 4, 5]}, "2": 3}');
 
 \set VERBOSITY terse \\ -- suppress cascade details
 DROP EXTENSION plperl CASCADE;
-NOTICE:  drop cascades to 8 other objects
+NOTICE:  drop cascades to 6 other objects

contrib/jsonb_plperl/expected/jsonb_plperlu.out

@@ -39,26 +39,6 @@ SELECT testSVToJsonb();
  1
 (1 row)
 
-CREATE FUNCTION testInf() RETURNS jsonb
-LANGUAGE plperlu
-TRANSFORM FOR TYPE jsonb
-AS $$
-$val = 9**9**9;  # we assume this will overflow to +Inf
-return $val;
-$$;
-SELECT testInf();
-ERROR:  cannot convert infinity to jsonb
-CONTEXT:  PL/Perl function "testinf"
-CREATE FUNCTION testNaN() RETURNS jsonb
-LANGUAGE plperlu
-TRANSFORM FOR TYPE jsonb
-AS $$
-$val = sin(9**9**9);  # we assume sin(inf) will yield NaN
-return $val;
-$$;
-SELECT testNaN();
-ERROR:  cannot convert NaN to jsonb
-CONTEXT:  PL/Perl function "testnan"
 -- this revealed a bug in the original implementation
 CREATE FUNCTION testRegexpResultToJsonb() RETURNS jsonb
 LANGUAGE plperlu
@@ -227,4 +207,4 @@ SELECT roundtrip('{"1": {"2": [3, 4, 5]}, "2": 3}');
 
 \set VERBOSITY terse \\ -- suppress cascade details
 DROP EXTENSION plperlu CASCADE;
-NOTICE:  drop cascades to 8 other objects
+NOTICE:  drop cascades to 6 other objects

contrib/jsonb_plperl/sql/jsonb_plperl.sql

@@ -34,28 +34,6 @@ $$;
 SELECT testSVToJsonb();
 
 
-CREATE FUNCTION testInf() RETURNS jsonb
-LANGUAGE plperl
-TRANSFORM FOR TYPE jsonb
-AS $$
-$val = 9**9**9;  # we assume this will overflow to +Inf
-return $val;
-$$;
-
-SELECT testInf();
-
-
-CREATE FUNCTION testNaN() RETURNS jsonb
-LANGUAGE plperl
-TRANSFORM FOR TYPE jsonb
-AS $$
-$val = sin(9**9**9);  # we assume sin(inf) will yield NaN
-return $val;
-$$;
-
-SELECT testNaN();
-
-
 -- this revealed a bug in the original implementation
 CREATE FUNCTION testRegexpResultToJsonb() RETURNS jsonb
 LANGUAGE plperl

contrib/jsonb_plperl/sql/jsonb_plperlu.sql

@@ -34,28 +34,6 @@ $$;
 SELECT testSVToJsonb();
 
 
-CREATE FUNCTION testInf() RETURNS jsonb
-LANGUAGE plperlu
-TRANSFORM FOR TYPE jsonb
-AS $$
-$val = 9**9**9;  # we assume this will overflow to +Inf
-return $val;
-$$;
-
-SELECT testInf();
-
-
-CREATE FUNCTION testNaN() RETURNS jsonb
-LANGUAGE plperlu
-TRANSFORM FOR TYPE jsonb
-AS $$
-$val = sin(9**9**9);  # we assume sin(inf) will yield NaN
-return $val;
-$$;
-
-SELECT testNaN();
-
-
 -- this revealed a bug in the original implementation
 CREATE FUNCTION testRegexpResultToJsonb() RETURNS jsonb
 LANGUAGE plperlu