intern.h: rb_str_new_literal
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47640 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
intern.h: rb_str_new_literal
from literal C-string. incorporated from mruby.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47640 b2dd03c8-39d4-4d8f-98ff-823fe69b080e