Ruby

• ext/dl/mkcallback.rb (foreach_proc_entry): extracted.
  (gencallback): ditto.
  (gen_push_proc_ary): ditto.
  (gen_push_addr_ary): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@18959 b2dd03c8-39d4-4d8f-98ff-823fe69b080e