Update to BIND 9.10.0-P2

This patch updates BIND to 9.10.0-P2 to fix CVE-2014-3859.

Additionally, it stops compiling dig with the SIGCHASE option. ISC's own Evan Hunt admitted* that the SIGCHASE code wasn't any good. Now that BIND ships with a new tool called "delv", which works much better, and was written specifically with DNSSEC validation in mind, dig no longer needs SIGCHASE.

*https://lists.isc.org/pipermail/bind-users/2012-May/087781.html