merge revision(s) r45595: [Backport #9743] [Backport #9745]

	* ext/openssl/ossl_pkey.c (ossl_pkey_verify): as EVP_VerifyFinal()
	  finalizes only a copy of the digest context, the context must be
	  cleaned up after initialization by EVP_MD_CTX_cleanup() or a
	  memory leak will occur.  [ruby-core:62038] [Bug #9743]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@45821 b2dd03c8-39d4-4d8f-98ff-823fe69b080e