merge revision(s) 41805: [Backport #8575] [Backport #8582]

	* lib/openssl/ssl.rb: Fix SSL client connection crash for SAN marked
	  critical.
	  The patch for CVE-2013-4073 caused SSL crash when a SSL server returns
	  the certificate that has critical SAN value.  X509 extension could
	  include 2 or 3 elements in it:
	  [id, criticality, octet_string] if critical,
	  [id, octet_string] if not.
	  Making sure to pick the last element of X509 extension and use it as
	  SAN value.
	  [ruby-core:55685] [Bug #8575]
	  Thank you @nahi for providing the patch!


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@41812 b2dd03c8-39d4-4d8f-98ff-823fe69b080e