SSL_[CTX_]set_not_resumable_session_callback.

Submitted by: Emilia Kasper (Google)

[A part of this change affecting ssl/s3_lib.c was accidentally commited
separately, together with a compilation fix for that file;
see s3_lib.c CVS revision 1.133 (http://cvs.openssl.org/chngview?cn=19855).]

(only s->new_session).

This will only be compiled in if explicitly requested
(#ifdef EC_NISTP224_64_GCC_128).

Submitted by: Emilia Kasper (Google)

Submitted By: Robin Seggelmann <seggelmann@fh-muenster.de>

Support for abbreviated handshakes when renegotiating.

Submitted by: Emilia Kasper (Google)

Submitted by: Corinna Vinschen

PR: 2319

Use consistent calculation for PSS salt length.

PR: 2309

ghash-x86.pl.

e_os2.h, this should fix WIN32 compilation issues and hopefully avoid
conflicts with other headers which may workaround ssize_t in different ways.

system.