Log Message:
pull in http://www.isc.org/products/BIND/patches/bind4910.diff.
bump PKGREVISION.

--
825. [bug]     the buffer used to construct the -ve record was not
               big enough for all possible SOA records.  use pointer
               arithmetic to calculate the remaining size in this
               buffer.
824. [bug]     use serial space arithmetic to determine if a SIG is
               too old, in the future or has internally constistant
               times.
824. [bug]     write buffer overflow in make_rr().
823. [bug]     getnetbyname() was broken.
822. [bug]     write buffer overflows in getnetby{name,addr}().