Eliminate the use of points and scalars from secp256k1_ecmult_strauss_batch. #900

  81 | @@ -82,7 +82,7 @@
  82 |   *  contain prej[0].z / a.z. The other zr[i] values = prej[i].z / prej[i-1].z.

---

  76 |   *  the same global z "denominator". zr must contain the known z-ratios such
  77 | - *  that mul(a[i].z, zr[i+1]) == a[i+1].z. zr[0] is ignored. The x and y
  78 | - *  coordinates of the result are stored in r, the common z coordinate is
  79 | - *  stored in globalz. */
  80 | -static void secp256k1_ge_globalz_set_table_gej(size_t len, secp256k1_ge *r, secp256k1_fe *globalz, const secp256k1_gej *a, const secp256k1_fe *zr);
  81 | + *  that mul(a[i].z, zr[i+1]) == a[i+1].z. zr[0] is ignored.

---

 438 | -    state.pre_a_lam = (secp256k1_ge*)secp256k1_scratch_alloc(error_callback, scratch, n_points * ECMULT_TABLE_SIZE(WINDOW_A) * sizeof(secp256k1_ge));
 439 |      state.ps = (struct secp256k1_strauss_point_state*)secp256k1_scratch_alloc(error_callback, scratch, n_points * sizeof(struct secp256k1_strauss_point_state));
 440 |  
 441 | -    if (points == NULL || scalars == NULL || state.prej == NULL || state.zr == NULL || state.pre_a == NULL || state.pre_a_lam == NULL || state.ps == NULL) {
 442 | +    if (state.aux == NULL || state.pre_a == NULL || state.ps == NULL ||
 443 | +            !secp256k1_ecmult_strauss_wnaf(&state, r, n_points, &secp256k1_ecmult_adaptor_cb, &adaptor_data, cb_offset, inp_g_sc)) {

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