Ruby

• variable.c (autoload_delete, autoload_file): should not delete
  autoload table, since it may be shared with duplicated modules.
  [ruby-core:19181]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@19710 b2dd03c8-39d4-4d8f-98ff-823fe69b080e