ibrowse: enable inet6 from upstream

[dch]

presently it's not possible to use ibrowse client (e.g. during replication) for
inet6-only hosts as the pattern match returned is insufficient. This patch
pulls in upstream's cmullaparthi/ibrowse@555f7074
minimal diff.

The patch will also require tagging so we can pull it into the main couchdb
tree, I've suggested CouchDB-4.0.2 which doesn't quite line up with the
history from ibrowse but it seems sensible enough.

Eshell V9.3.3.3  (abort with ^G)
1> inet:gethostbyname("wintermute.skunkwerks.at").
{error,nxdomain}
2> inet:gethostbyname("wintermute.skunkwerks.at", inet6).
{ok,{hostent,"wintermute.skunkwerks.at",[],inet6,16,
             [{64635,50390,27618,36432,27800,0,0,1}]}}

[nickva]

Noticed there was another ibrowse commit after that which fixed an issue related to ipv6 being the new default:

cmullaparthi/ibrowse@e6a0c36

Wonder if we'd need that as well?