ddns-scripts: Ver.2.6.0 - support hostip and uclient-fetch

ddns-scripts: Ver.2.6.0 - support hostip and uclient-fetch

- add support for "hostip" to get_registered_ip() as alternative to "Bind host" package https://dev.openwrt.org/ticket/20893#comment:5
- allow to send updates using compiled-in certificate file/path of curl/wget #2242 #2243 #2245
- add support for uclient-fetch / libustream-ssl.so
- remove /128 prefix-filter in get_local_ip() via interface #2268
- add dyndns.org to services_ipv6 https://forum.openwrt.org/viewtopic.php?id=62103
- readd duckdns.org to services #2251 (lost somewhere in data heaven)
- add zzzz.io service #2302
- updated tld_names.dat

Signed-off-by: Christian Schoenebeck <redacted>