Clear error queue in a few places in SSL code where errors are expected
so they don't stay in the queue.

Submitted By: Jaroslav Imrich <jaroslav.imrich@disig.sk>

The prompt_info and wrong_info parameters can be empty strings which
can produce confusing prompts. Treat empty string same as NULL.

Submitted By: Jaroslav Imrich <jaroslav.imrich@disig.sk>

Add "missing" functions to get and set prompt constructor.

Submitted By: "Joel Rabinovitch" <Joel.Rabinovitch@tecsys.com>

Detect aix64-gcc

values.

found in an ENGINE.

PR#1999 broke fork detection by assuming HAVE_FORK was set for all platforms.
Include original HAVE_FORK detection logic while allowing it to be
overridden on specific platforms with -DHAVE_FORK=1 or -DHAVE_FORK=0

Fix for CVE-2010-0433 where some kerberos enabled versions of OpenSSL
could be crashed if the relevant tables were not present (e.g. chrooted).

Submitted by: Andreas Krebbel

Submitted by: "Kennedy, Brendan" <brendan.kennedy@intel.com>

Handle error codes correctly: cryptodev returns 0 for success whereas OpenSSL
returns 1.

1.0.0. Original fix was on 2007-Mar-09 and had the log message: "Fix kerberos
ciphersuite bugs introduced with PR:1336."

CFB mode does *not* have to be a multiple of the block length and several
other specifications (e.g. PKCS#11) do not require this.

X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT error codes were reversed in
the verify application documentation.

(The CHANGES entry covers the change from PR #2111 as well, submitted by
Martin Olsson.)

Submitted by: Neel Mehta

initial connection to unpatched servers. There are no additional security
concerns in doing this as clients don't see renegotiation during an
attack anyway.

Submitted by: James Baker <jbaker@tableausoftware.com> et al.

Workaround for slow Heap32Next on some versions of Windows.

Don't leave dangling pointers in GOST engine if calls fail.

Submitted by: Tomas Mraz <tmraz@redhat.com>

Since SSLv2 doesn't support renegotiation at all don't reject it if
legacy renegotiation isn't enabled.

Also can now use SSL2 compatible client hello because RFC5746 supports it.