- Set default perl version for ports which currently using
  (5.x+ and x < 12) scheme.

Approved by: bapt@ (portmgr@)

git-svn-id: http://svn.freebsd.org/ports/head/devel/p5-Regexp-Grammars@308985 35697150-7ecd-e111-bb59-0022644237b5