multiprocess: Add Ipc and Init interface definitions

src/Makefile.am

@@ -159,6 +159,8 @@ BITCOIN_CORE_H = \
   init/common.h \
   interfaces/chain.h \
   interfaces/handler.h \
+  interfaces/init.h \
+  interfaces/ipc.h \
   interfaces/node.h \
   interfaces/wallet.h \
   key.h \
@@ -559,6 +561,7 @@ libbitcoin_util_a_SOURCES = \
   compat/strnlen.cpp \
   fs.cpp \
   interfaces/handler.cpp \
+  interfaces/init.cpp \
   logging.cpp \
   random.cpp \
   randomenv.cpp \