Update to version 9.6-ESV-R4, the latest from ISC, which addresses

Update to version 9.6-ESV-R4, the latest from ISC, which addresses
the following security vulnerabilities.

For more information regarding these issues please see:
http://www.isc.org/announcement/guidance-regarding-dec-1st-2010-security-advisories

1. Cache incorrectly allows ncache and rrsig for the same type

   http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3613

   Affects resolver operators whose servers are open to potential
   attackers. Triggering the bug will cause the server to crash.

   This bug applies even if you do not have DNSSEC enabled.

2. Key algorithm rollover

   http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3614

   Affects resolver operators who are validating with DNSSEC, and
   querying zones which are in a key rollover period. The bug will
   cause answers to incorrectly be marked as insecure.

Approved by:	re (kensmith)

git-svn-id: svn://svn.freebsd.org/base/stable/8@216307 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f