This reverts commit b68fa5ec.

Replaces commit 8eecc9a0

This reverts commit f8d944cb. Not needed
anymore, since libldif was merged into libldap. Additionally the commit
broke linking with "--as-needed".

Use PERL_SYS_INIT() instead of broken PERL_SYS_INIT3(,,NULL).  Pass its
output variables to perl_parse().  Fix argument type 'char *(*argv)[3]'
to 'char ***argv'.  NULL-terminate argv in case that is needed.

slap_send_search_entry(), slap_send_search_reference(): Never skip
the cleanup code.  Sending an entry did on sizeLimitExceeded/busy.
Sending a ref dropped rs_flush_entry() on error.

Seems simpler this way. No need for a back-config specific
bi_access_allowed() handler.

more for ITS#7066

Dynamically adding ACL for cn=config didn't work correctly, when no
ACLs where present for that database upon startup. Delete the last
ACL from the DB could also lead to unexpected results.

2-byte alignment isn't good enough for subpages

So they can be reused, and avoid unnecessary page_searches

Bug was caused by postalAddressNormalize sending 0-length values
to UTF8StringNormalize.

Detected by valgrind

Well, just like in back-bdb in 2005, it only slowed things down
on larger LDIFs.

Sub-pages need room to grow...

NULL out env->pghead before writing it, so that its pages can't be used
to satisfy the write.