Fix platform and Perl-version dependencies in new jsonb_plperl code.

Testing SvTYPE() directly is more fraught with problems than one might
think, because depending on context Perl might be storing a scalar value
in one of several forms, eg both numeric and string values.  This resulted
in Perl-version-dependent buildfarm test failures.  Instead use the SvTYPE
test only to distinguish non-scalar cases (AV, HV, NULL).  Disambiguate
scalars by testing SvIOK, SvNOK, then SvPOK.  This creates a preference
order for how we will resolve cases where the value is available in more
than one form, which seems fine to me.

Furthermore, because we're now dealing directly with a "double" value
in the SvNOK case, we can get rid of an inadequate and unportable
string-comparison test for infinities, and use isinf() instead.
(We do need some additional #include and "-lm" infrastructure to use
that in a contrib module, per prior experiences.)

In passing, prevent the regression test results from depending on DROP
CASCADE order; I've not seen that malfunction, but it's trouble waiting
to happen.

Discussion: https://postgr.es/m/E1f3MMJ-0006bf-B0@gemulon.postgresql.org

contrib/jsonb_plperl/Makefile

@@ -11,6 +11,8 @@ DATA = jsonb_plperlu--1.0.sql jsonb_plperl--1.0.sql
 
 REGRESS = jsonb_plperl jsonb_plperlu
 
+SHLIB_LINK += $(filter -lm, $(LIBS))
+
 ifdef USE_PGXS
 PG_CONFIG = pg_config
 PGXS := $(shell $(PG_CONFIG) --pgxs)