Clear the DNS Cache

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Demonstrates Socket.DnsCacheClear, which clears Chilkat's process-wide in-memory DNS cache so subsequent hostname resolutions perform a new lookup.

let socket = chilkat::Socket::new();

// Clear Chilkat's process-wide in-memory DNS cache.  Subsequent hostname resolutions perform a new
// lookup as needed.  The cache is shared by Chilkat objects in the process.
socket.dns_cache_clear();
println!("DNS cache cleared.");