Map all the existing VLC mirrors that already support HTTPS

This ticket is to map all the existing VLC mirrors that already support HTTPS in order to have a detailed and precise view on how much of them can starts serving VLC related files over a secure channel since tomorrow.

Once that mapping has been done, it's useful to analyse those mirrors for how much (in % percentage) of the total download traffic account, because if those represent =>80% of download traffic, it would maybe reasonable to think to cut the remaining 20% unless they enable HTTPS within few months.