Set flags without relying on errno (this change may be gratuitous
or wrong).

More error checking and reporting.
Slowly getting there, SSL_accept succeeds now, but connection breaks
immediately after that (my glue logic with slapd is broken).

Change temporarily the default protocol from TLSv1 to SSLv3 with
fallback to SSLv2.  This seems necessary for slapd to accept connections
from Netscape.
Try to set the cipher list in the default context.  Does not semm to
work yet.

First version of TLS glue for SSLeay/OpenSSL originally written by
Bart Hartgers.  Untested.