Ticket #47875 - dirsrv not running with old openldap
    
    Description: Changing the function of AC_CHECK_LIB from ldif_open
    to _init so that regardless of the contents of the library, it's
    linked to the server if it exists.
    
    https://fedorahosted.org/389/ticket/47875
    
    Reviewed by rmeggins@redhat.com (Thank you, Rich!!)
    (cherry picked from commit 38c74d224c250abd907636f7d78e95775ebf63dd)
    (cherry picked from commit 4917a5e4856c7fe0fb4f9b023c21eb64f277e319)