Added note about the support end of Samba 3 to WHATSNEW.TXT

[Sonic]

On Thu, Nov 6, 2014 at 4:51 PM, Jelmer Vernooij <jelmer at samba.org> wrote:
> 1) build it without AD support and using your system Kerberos
> 2) build it with AD support and the bundled Heimdal, which can co-exist
>  with the MIT Kerberos on your system

Good to know. Looks like I'll need to roll my own ebuild or do it the long way.

Thanks,

Chris