Change Details

This will be used by the schnorrsig module This is a partial backport of secp256k1 PR558 : https://github.com/bitcoin-core/secp256k1/pull/558/commits/eabd9bc46a31c0da6db6d88840eadbe9006447b1

This will be used by the schnorrsig module This is a partial backport of secp256k1 [[https://github.com/bitcoin-core/secp256k1/pull/558 | PR558]] : https://github.com/bitcoin-core/secp256k1/pull/558/commits/eabd9bc46a31c0da6db6d88840eadbe9006447b1

This will be used by the schnorrsig module This is a partial backport of secp256k1 [[https://github.com/bitcoin-core/secp256k1/pull/558 | PR558]] : https://github.com/bitcoin-core/secp256k1/pull/558/commits/eabd9bc46a31c0da6db6d88840eadbe9006447b1