Bump DAL major version for iterate change

Commit ab009b8568d9b64b7e992ecdb98114e895b4a7ff for issue #7977
changed the signature of krb5_db_iterate() and properly bumped
KRB5_KDB_API_VERSION from 7 to 8.  It also changed the signature of
the DAL iterate() function, but did not bump
KRB5_KDB_DAL_MAJOR_VERSION.  Bump that version from 4 to 5 now.

(cherry picked from commit 58f6636ba3af96f7b94ba6d4b2c91b61fc85e58a)

https://github.com/krb5/krb5/commit/5ba284b94e8d755f3b8b9d27767db88f3be66286
Author: Greg Hudson <ghudson@mit.edu>
Committer: Tom Yu <tlyu@mit.edu>
Commit: 5ba284b94e8d755f3b8b9d27767db88f3be66286
Branch: krb5-1.13
 src/include/kdb.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)