change in __res_state.nscount

[Antonio Querubin <tony@lavanauts.org>]

Hello,

It was brought to my attention that in the upcoming Debian release 
(jessie), the value of the nscount member of __res_state will include ONLY 
IPv4 nameservers:

https://lists.debian.org/debian-glibc/2014/06/msg00138.html

I just want to point out that this departs significantly from other 
Linux/Unix where nscount has traditionally included ALL resolvers listed 
in /etc/resolv.conf (up to MAXNS) regardless of whether they are IPv4 or 
IPv6 addresses.

This will break name resolution for some applications.  In the extreme 
case where only IPv6 nameservers are listed in /etc/resolv.conf, name 
resolution will fail completely for those apps.

It's not clear to me what actually triggered the need for this change but 
perhaps there's another way to address the original issue without changing 
the behaviour of nscount.

Antonio Querubin
e-mail:  tony@lavanauts.org
xmpp:  antonioquerubin@gmail.com