[krbdev.mit.edu #8261] configure should auto-detect OpenLDAP libs on Solaris 11 and higher

[Greg Hudson via RT]

We should be able to make the LDAP KDB module work against the Mozilla LDAP 
library again, if the Solaris team has a preference for that.  I have 
patches which make it compile, although it's not easy to test them as our 
automated tests rely on ldapi support.  If you have no preference, we'll 
continue to rely on OpenLDAP features (ldap_str2dn and LDAP_SASL_QUIET) to 
keep the code simpler.

(As for the request in this ticket, it seems reasonable if we continue to 
depend on OpenLDAP, but I don't have a Solaris 11 machine to test a 
candidate patch on.)