MS Server gated cryptography is obsolete and dates from the time of export
restrictions on strong encryption and is only used by ancient versions of
MSIE.
Reviewed-by: Matt Caswell <matt@openssl.org>
(cherry picked from commit 63eab8a620944a990ab3985620966ccd9f48d681)
Fix nasty SSL BIO pop bug. Since this changes the behaviour of SSL BIOs and
will break applications that worked around the bug only included in 1.0.0 and
later.