dhcp6 client patch upstream

[Yuxiao Zhang]

Hello busybox team,

I have a simple patch related to dhcpv6 fqdn option. The context is that
according to RFC4704, the server should send fqdn in dns encoding format.
But some servers are still using plain text format. The patch is to
workaround this issue.
Basically the patch will check the first data byte, if it is greater than
63, which means that it is impossible to be a dns encoding format. In this
case it will parse the fqdn part as plain text.

Attached is the patch, let me know if the patch is acceptable. Also since
this is my first time upstreaming a patch to busybox, feel free to
suggest any additional process that I need to follow to make this work.

Thanks,
-Yuxiao
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