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Re: (ITS#7428) libldap: use non-blocking IO during TLS handshake

I've just uploaded:

ftp://ftp.openldap.org/incoming/rhafer-Use-non-blocking-IO-during-SSL-Handshake-ITS-7428.dif

which tries to address the issue. If LDAP_OPT_NETWORK_TIMEOUT is set
ldap_int_tls_start will switch to non-blocking IO and call
ldap_int_tls_connect as often as needed unless it times out inbetween.
Currently I have only tested this with openssl but AFAICS this should also work
with the NSS and gnutls backends

Please review and comment.

Ralf