use stringized macros
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53478 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
use stringized macros
RUBY_BIRTH_YEAR_STR and RUBY_RELEASE_YEAR_STR.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53478 b2dd03c8-39d4-4d8f-98ff-823fe69b080e