Change Details

Partial backport 10/11 of secp256k1 PR830: https://github.com/bitcoin-core/secp256k1/pull/830/commits/63c6b71616816b19bec9cb3ab6b45ae5afd955f0 Depends on D8045.

Partial backport 10/11 of secp256k1 [[https://github.com/bitcoin-core/secp256k1/pull/830 | PR830]]: https://github.com/bitcoin-core/secp256k1/pull/830/commits/63c6b71616816b19bec9cb3ab6b45ae5afd955f0 Depends on D8045.

Partial backport 10/11 of secp256k1 [[https://github.com/bitcoin-core/secp256k1/pull/830 | PR830:]]: https://github.com/bitcoin-core/secp256k1/pull/830/commits/63c6b71616816b19bec9cb3ab6b45ae5afd955f0 Depends on D8045.