Localhost DNS lookup fails without network connection #524

Hi! Thanks again for the lib!

I mostly use this library on windows to connect to a local server via "wss://localhost". This normally works fine, but when not connected to a network (network cable unplugged and not connected to wifi), IXWebsockets fails to connect to my server.

I tracked it down to failing DNS lookup of localhost. Digging into the code, I see getaddrinfo is configured not to do lookups when a with only a loopback address available (hint AI_ADDRCONFIG is set):

As a workaround I tested to remove that flag and my program started working as expected.

I'm not proficient in winsock etc, so I can't tell if there any specific reason for the flag to be set for the library or can it be removed or made configurable?

Thanks!