Eliminate na_1 and na_lam state fields from ecmult_strauss_wnaf.
Eliminate na_1 and na_lam state fields from ecmult_strauss_wnaf.

bitcoin-core/secp256k1,ElementsProject/secp256k1-zkp,bitcoin/secp256k1,bitcoin/secp256k1,peterdettman/secp256k1,peterdettman/secp256k1,bitcoin-core/secp256k1,ElementsProject/secp256k1-zkp,bitcoin/secp256k1,bitcoin/secp256k1,bitcoin/secp256k1