Add destructor to Machine_info class to fix segfault

sources/machine_info.cpp

@@ -147,7 +147,15 @@ void Machine_info::send_info_to_debug()
 			+ " x "
 			+ QString::number(pc.screen.height[ii])
 			+ " )";
-	}
+		}
+}
+
+/**
+	@brief Machine_info::~Machine_info
+	destructor
+*/
+Machine_info::~Machine_info()
+{
 }
 
 /**