Use minetest logging facilities for irrlicht log output

src/client/inputhandler.h

@@ -85,10 +85,18 @@ class MyEventReceiver : public IEventReceiver
 					mouse_wheel += event.MouseInput.Wheel;
 				}
 			}
-		}
-		if (event.EventType == irr::EET_LOG_TEXT_EVENT) {
-			dstream << std::string("Irrlicht log: ") + std::string(event.LogEvent.Text)
-			        << std::endl;
+		} else if (event.EventType == irr::EET_LOG_TEXT_EVENT) {
+			static const enum LogMessageLevel irr_loglev_conv[] = {
+				LMT_VERBOSE, // ELL_DEBUG
+				LMT_INFO, // ELL_INFORMATION
+				LMT_ACTION, // ELL_WARNING
+				LMT_ERROR, // ELL_ERROR
+				LMT_ERROR, // ELL_NONE
+			};
+			assert(event.LogEvent.Level < sizeof(irr_loglev_conv));
+			log_printline(irr_loglev_conv[event.LogEvent.Level],
+				std::string("Irrlicht: ")
+				+ (const char*) event.LogEvent.Text);
 			return true;
 		}
 		/* always return false in order to continue processing events */