- new function expand_ipv6()
- expand IPv6 before compare https://dev.openwrt.org/ticket/21725
- Fix split_FQDN() to return host.subdomain correctly  #2334
- modified check for musl library used by nslookup #2341 #2346 thanks to Arjen de Korte

Signed-off-by: Christian Schoenebeck <christian.schoenebeck@gmail.com>