* 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_6@21939 b2dd03c8-39d4-4d8f-98ff-823fe69b080e