merge revision(s) 45271: [Backport #9672]

	* ext/openssl/ossl.c (ossl_make_error): check NULL for unknown
	  error reasons with old OpenSSL, and insert a colon iff formatted
	  message is not empty.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@45485 b2dd03c8-39d4-4d8f-98ff-823fe69b080e