+libadns (optional) support
+This small library may be a part of ev, e.g. EvADNS singleton class. There are
+some ideas how to include libadns into libev by means of prepare/check, timer
+Still don't like namespaces. I guess EvADNS class will look pretty good.
+It's rather simple to install it on different platforms. libadns is packaged
+for many distros. However, for those who don't like to include it into ev,
+we'll make a configure option.