Code review comment for lp:~thomir-deactivatedaccount/drizzle/drizzle-struct-class-conversion

Build failures:

 CXX plugin/mysql_unix_socket_protocol/plugin_libmysql_unix_socket_protocol_plugin_la-protocol.lo
../plugin/mysql_protocol/vio.h: In function ‘uint32_t my_real_read(NET*, size_t*)’:
../plugin/mysql_protocol/vio.h:130: error: ‘int Vio::sd’ is private
../plugin/mysql_protocol/net_serv.cc:681: error: within this context
make[3]: *** [plugin/mysql_protocol/plugin_libmysql_protocol_plugin_la-net_serv.lo] Error 1