Ticket #47875 - dirsrv not running with old openldap
Description: AC_SUBST(ldap_lib_ldif) was missing from configure.ac
for @ldap_lib_dir@.
https://fedorahosted.org/389/ticket/47875
Reviewed by rmeggins@redhat.com (Thank you, Rich!!)
(cherry picked from commit 0ae55bcd61497c2fa7aaade40fe4ff6c91216325)