C64x+ assembly pack: make it work with older toolchain.
C64x+ assembply pack: add RC4 module.
md5/asm/md5-[586|x86_64].pl: +15% on Atom.

[MD5 is hardly relevant, just cleaning up repository]
apps/s_server: document '-naccept' cmd-line argument

Signed-off-by: Geoff Thorpe <geoff@openssl.org>
Unit/regression test for TLS heartbeats.

Regression test against CVE-2014-0160 (Heartbleed).

More info: http://mike-bland.com/tags/heartbleed.html