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This fixes an error reported by Antoine Poinsot <darosior@protonmail.com> in https://github.com/bitcoin-core/libmultiprocess/issues/123 that does not happen in master, but does happen with https://github.com/bitcoin/bitcoin/pull/10102 applied, where if Ctrl-C is pressed when `bitcoin-node` is started, it is handled by both `bitcoin-node` and `bitcoin-wallet` processes, causing the wallet to shutdown abruptly instead of waiting for the node and shutting down cleanly. This change fixes the problem by having the wallet process print to stdout when it receives a Ctrl-C signal but not otherwise react, letting the node shut everything down cleanly.