ec_GFp_simple_is_at_infinity
int ec_GFp_simple_is_at_infinity(const EC_GROUP *, const EC_POINT *);
.is_at_infinity = ec_GFp_simple_is_at_infinity,
.is_at_infinity = ec_GFp_simple_is_at_infinity,
.is_at_infinity = ec_GFp_simple_is_at_infinity,