2 - Correctly detect failures to create DNS requests when using Libevent
3 versions before v2. (Before Libevent 2, we used our own evdns
4 implementation. Its return values for Libevent's evdns_resolve_*()
5 functions are not consistent with those from Libevent.) Found by
6 Lodger; fixes bug 2363; bugfix on 0.2.2.6-alpha.