Merge 359f72105b into merged_master (Bitcoin PR bitcoin/bitcoin#21573)

Just did this manually with `-s ours` to keep our current version of secp-zkp.

We should update secp-zkp, but this upstream merge doesn't have any API changes
so it's ok to skip it for now.
This commit is contained in:
Andrew Poelstra 2021-07-23 02:42:11 +00:00
commit 3c8e88e7cf

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