argument become optional.
* ext/openssl/ossl_x509name.c (ossl_x509name_initialize): ditto.
* ext/openssl/ossl_x509name.c (Init_x509name): emailAddress and
domainComponent should be IA5String.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@5549 b2dd03c8-39d4-4d8f-98ff-823fe69b080e