multiprocess: Add Ipc interface implementation

src/logging.cpp

@@ -157,6 +157,7 @@ const CLogCategoryDesc LogCategories[] =
     {BCLog::LEVELDB, "leveldb"},
     {BCLog::VALIDATION, "validation"},
     {BCLog::I2P, "i2p"},
+    {BCLog::IPC, "ipc"},
     {BCLog::ALL, "1"},
     {BCLog::ALL, "all"},
 };