build: Move interfaces/* to libbitcoin_server
Backport of Core PR 14204
Fixes cmake build issue where interfaces/wallet.cpp wasn't linking correctly in D2817
Test Plan: Build D2817 with this diff applied instead of the linking attempts included in that diff.
Reviewers: deadalnix, Fabien, #bitcoin_abc
Reviewed By: Fabien, #bitcoin_abc
Differential Revision: https://reviews.bitcoinabc.org/D2842