SSL_CTRL_SET_GROUPS
SSL_CTX_ctrl(ctx, SSL_CTRL_SET_GROUPS, glistlen, (int *)(glist))
SSL_ctrl(s, SSL_CTRL_SET_GROUPS, glistlen, (char *)(glist))
#define SSL_CTRL_SET_CURVES SSL_CTRL_SET_GROUPS
case SSL_CTRL_SET_GROUPS:
case SSL_CTRL_SET_GROUPS: