Update SSL cipher setup with upstream changes

* lib/openssl/ssl.rb: Explicitly whitelist the default
  SSL/TLS ciphers. Forbid SSLv2 and SSLv3, disable
  compression by default.
  Reported by Jeff Hodges.
  [ruby-core:59829] [Bug #9424]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45274 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Conflicts:
	ChangeLog
	ext/openssl/lib/openssl/ssl.rb