Cygwin: //server: check existence of server with getaddrinfo

Checking server existence by trying to enumerate its shares
may result in 2 minutes delay until some internal timeout is hit.

In the light that every network is an IP network anyway these
days, let's try with a simple getaddrinfo() call.  This is usually
back in 3 secs even if the server doesn't exist, and it's usually
back in 8 secs if the DNS server can't be connected.  This is the
fastest method I found to check server existence yet.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

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