perl: version modules and non-base packages

Currently external modules and non-base packages are numbered
from their own internal number space, and even though the Perl
ABI number is embedded into them this isn't externally visible.

For example, perl-html-parser-3.72.1 could be built for ABI
5.26 or for 5.28, we can't easily tell.  This changes all of
that by embedding the ABI number into the filename.

Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>

lang/perl/perlver.mk

@@ -0,0 +1,10 @@
+PERL_VERSION:=5.28.0
+
+PERL_EXPLODE:=$(subst ., ,$(PERL_VERSION))
+
+PERL_MAJOR:=$(word 1,$(PERL_EXPLODE))
+PERL_MINOR:=$(word 2,$(PERL_EXPLODE))
+PERL_REL:=$(word 3,$(PERL_EXPLODE))
+
+PERL_VERSION3:=$(PERL_VERSION)
+PERL_VERSION2:=$(PERL_MAJOR).$(PERL_MINOR)