Deprecate the "connected slave" feature
I ported its last user, akonadi_pop3_resource, away from it, so now it can be deprecated (so that KIO::Scheduler can stop being exported, in KF6)
I ported its last user, akonadi_pop3_resource, away from it, so now it can be deprecated (so that KIO::Scheduler can stop being exported, in KF6)