Don't use Win32 specific options in mk1mf.pl to build assembly language
files.

turn out to be made somewhere by existing Makefiles.

Only use -MMD and .sinclude in copy builds: other platforms don't
support them.

Since s->method does not reflect the final client version when a client
hello is sent for SSLv23_client_method it can't be relied on to indicate
if TLS 1.2 ciphers should be used. So use the client version instead.

Give CBC decrypt approximately same treatment as to CTR and collect 25%.

Submitted by: David Miller

(cherry picked from commit 944bc29f9004cf8851427ebfa83ee70b8399da57)

Port TLS 1.2 GCM code to DTLS. Enable use of TLS 1.2 only ciphers when in
DTLS 1.2 mode too.

The relaxed signing requirements for fixed DH certificates apply to DTLS 1.2
too.

Add DTLS1.2 support for cached records when computing handshake macs
instead of the MD5+SHA1 case for DTLS < 1.2 (this is a port of the
equivalent TLS 1.2 code to DTLS).

Don't check for binary curves by checking methods: the values will
be different in FIPS mode as they are redirected to the validated module
version.

Add correct flags for DTLS 1.2, update s_server and s_client to handle
DTLS 1.2 methods.

Currently no support for version negotiation: i.e. if client/server selects
DTLS 1.2 it is that or nothing.