6640074d34 bitcoin/bip32: add DerivationPath::to_u32_vec (Marko Bencun)
Pull request description:
This is useful to pass the keypath to other libraries which expect it to be represented with a list of u32 ints.
Fixes#1944
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Tree-SHA512: c2327716370558dd9d7e0419f898707ba5e56555284ea7ca746c973080061aae53674b41d8fe7c68a00d7c4bec1e4bb53e8991141749a87dfa40febe9f456369