Add std::unordered_set support and a helper BuildList to dedup list build handlers#277

ryanofsky merged 3 commits into

bitcoin-core:masterbitcoin-core/libmultiprocess:masterfrom

ViniciusCestarii:add-unordered-set-supportViniciusCestarii/libmultiprocess:add-unordered-set-supportCopy head branch name to clipboard