Not sure if this is even worth opening a bug, but I noted that the dnscrypt ebuild references the upstream Homepage as http://dnscrypt.org/ which forwards to https only at https://dnscrypt.org/ The downloads are available through both http/https, but given that dnscrypt.org has hsts with includesubdomains it's probably intended to use them over https as well.
this is already fixed in latest version (1.7.0), so close it