ext/openssl/ossl_cipher.c: fix errors for installations that do not
feature Authenticated Encryption.
ext/openssl/extconf.rb: detect presence of EVP_CTRL_GCM_GET_TAG to
determine whether Authenticated Encryption can be used.
[Feature #6980] [ruby-core:47426]
feature Authenticated Encryption.
determine whether Authenticated Encryption can be used.
[Feature #6980] [ruby-core:47426]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38492 b2dd03c8-39d4-4d8f-98ff-823fe69b080e