shadowsocks-libev: ss-rules: resolve server names before adding to ipset

ipset command line utility supports ranges of address: IP-IP, but the
dash character is also valid character in host names.  If we have a
remote server ss-00.example.com, ipset may complain that

    ipset v6.32: Syntax error: cannot parse ss: resolving to IPv4 address failed

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

net/shadowsocks-libev/files/ss-rules

@@ -112,6 +112,7 @@ ss_rules_parse_args() {
 		__errmsg "Please install iptables-mod-conntrack-extra with opkg"
 		return 1
 	fi
+	o_remote_servers="$(for s in $o_remote_servers; do resolveip "$s"; done)"
 }
 
 ss_rules_flush() {