SSL_CONF_CTX_set1_prefix
__owur int SSL_CONF_CTX_set1_prefix(SSL_CONF_CTX *cctx, const char *pre);
if (!SSL_CONF_CTX_set1_prefix(s_cctx, "-s_")) {
if (!SSL_CONF_CTX_set1_prefix(s_cctx2, "-s_")) {
if (!SSL_CONF_CTX_set1_prefix(c_cctx, "-c_")) {