Fixed .id => .object_id in TMail

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@1082 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionmailer/lib/action_mailer/vendor/tmail/port.rb

@@ -303,11 +303,11 @@ module TMail
     alias eql? ==
 
     def hash
-      @buffer.id.hash
+      @buffer.object_id.hash
     end
 
     def inspect
-      "#<#{self.class}:id=#{sprintf '0x%x', @buffer.id}>"
+      "#<#{self.class}:id=#{sprintf '0x%x', @buffer.object_id}>"
     end
 
     def reproducible?