Bug#988565: slapd-contrib: smbk5pwd crashes when enabling krb5 (again)

[Ryan Tandy]

Looks like this is a legitimate bug in how we build smbk5pwd. It's not 
linking -lkrb5, so it doesn't see its versioned symbols. This would have 
been introduced when we switched to heimdal-multidev and started using 
krb5-config, so quite a while ago.