causes ldap_pvt_thread_self to be called with the wrong prototype.

That can cause OpenSSL to use a garbage value, e.g. if the unsigned
long it expects takes two words but ldap_pvt_thread_t is an int.

I'm fixing it in HEAD now and also provoking an error if unsigned
long cannot hold a ldap_pvt_thread_t.  Otherwise it can silently
compile to broken code.  Maybe the latter should go in configure,
but since OpenSSL presumably breaks anyway if that fails I don't
see much point at this time.

Remove a bogus 'waiting' message; the script does not sleep there.

re-parse ID from passmod request, if necessary (ultimately fixes ITS#4964, along with fix to ITS#4973)

LBER_ALIGNED_BUFFER(OPERATION_BUFFER_SIZE), as discussed in ITS#4078.
Add a corresponding SyncOperationBuffer in overlays/syncprov.c.

Also plug a memory leak, set state vars even when unused for the sake of
debugging, and tweak some readability issues & data types.

check for NULL dn in URL; set error code before seding extended response (partially addresses ITS#4968)

The Written Word and Stanford University.