lang/ruby2*: fix dtrace support

DTrace support in ruby needs the -xnolibs flag added to the dtrace command
called during build to ensure that dtrace support is enabled even if the dtrace
kernel modules are not loaded at build time.

However, with this dtrace will be enabled on some OS versions where it will not
work, so add logic to disable it where appropriate.
This plugin makes it very easy to create Dancer2 applications that
interface with databases. It automatically exports the keyword `schema`
which returns a DBIx::Class::Schema object. You just need to configure
your database connection information. For performance, schema objects
are cached in memory and are lazy loaded the first time they are accessed.

WWW: https://github.com/ironcamel/Dancer2-Plugin-DBIC

PR:		193712
Submitted by:	Henk van Oers<hvo.pm@xs4all.nl>
Remove support for old autoconf and automake versions from USE_AUTOTOOLS:
autoconf213, autoheader213, aclocal14 and automake14

Approved by:	portmgr (bapt)