explictly link with liblber

Upcoming Fedora will bring a change how the linker utility works with libraries. Until now it implicitly also used libraires marked as NEEDED in other library, but in the future such libraries must be explicitly mentioned on the command line, please see http://fedoraproject.org/wiki/Features/ChangeInImplicitDSOLinking for the details. In Zabbix builds it applies only to the lber library (part of openldap), see the attached files for a fix.