SSL_CTRL_SET_SIGALGS
SSL_CTX_ctrl(ctx, SSL_CTRL_SET_SIGALGS, slistlen, (int *)(slist))
SSL_ctrl(s, SSL_CTRL_SET_SIGALGS, slistlen, (int *)(slist))
case SSL_CTRL_SET_SIGALGS:
case SSL_CTRL_SET_SIGALGS: