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.

directory: currently the GOST ENGINE is the only case.

this means that some implementations will be used automatically, e.g. aesni,
we do this for cryptodev anyway.

Setup cpuid in ENGINE_load_builtin_engines() too as some ENGINEs use it.

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

Support for RFC5705 key extractor.

PR: 2307