Parallel A and AAAA record lookups with c-ares
Check non-loopback (and non-linklocak for IPv6) address is configured

Issue A record query only when non-loopback IPv4 address is
configured.  Likewise, issue AAA record query only when non-loopback
and non-linklocak IPv6 address is configured.
Use GetAdaptersAddresses for Mingw
Use util::sleep() instead of sleep()
mingw: Ignore tunnel interface and address in 169.254.*
Implement simple Happy Eyeballs for HTTP/FTP downloads
Use AsyncNameResolverMan in DHTEntryPointNameResolveCommand
Fix uninitialized UDPTrackerClient::numWatchers_
Use AsyncNameResolverMan in NameResolveCommand
Rewrite async DNS portion without exception
Fix compile error without c-ares