avoid name confliction on mswin32. * ext/openssl/ssl.c (ossl_protect_obj2bio): avoid VC++ warnings in function prototype. * ext/openssl/ssl.c (ossl_protect_membio2str): ditto. * ext/openssl/ssl.c (ossl_protect_x509_ary2sk): ditto. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@4134 b2dd03c8-39d4-4d8f-98ff-823fe69b080e