Ticket #461 - fix build problem with mozldap c sdk
    
    https://fedorahosted.org/389/ticket/461
    Reviewed by: rmeggins
    Fixed by: cgrzemba
    Branch: master
    Fix Description: mozldap does not define LDAP_MOD_OP so define it
    Platforms tested: RHEL6 x86_64
    Flag Day: no
    Doc impact: no