This enables users to preresolve but still take advantage of happy
eyeballs and trying multiple addresses if some are not connecting.
Ref: https://github.com/curl/curl/pull/2260
... so that IPv6 addresses can be passed like they can for connect-to
and how they're used in URLs.
Added test 1324 to verify
Reported-by: Alex Malinovich
Fixes#2087Closes#2091