Log Message:
Attempt to fix various build issues:

 - Explicitly disable samba-regedit for now, it is built depending on
   various curses characteristics that we do not currently support.

 - Avoid epoll implementation on SmartOS.

 - Pull in Active Directory and LDAP options from net/samba, LDAP support
   is dynamically configured and we need to ensure that, if enabled, we
   correctly pull in openldap.  The SunOS native LDAP is missing some TLS
   functions that Samba depends upon.

Tested with various PKG_OPTIONS combinations, fixes build on SmartOS.