Static deltachat::net::dns::DNS_PRELOAD

static DNS_PRELOAD: Lazy<HashMap<&'static str, Vec<IpAddr>>>

Preloaded DNS results that can be used in case of DNS server failures.

See https://support.delta.chat/t/no-dns-resolution-result/2778 and https://github.com/deltachat/deltachat-core-rust/issues/4920 for reasons.