Add include guard to logcategories.h

QTProject/logcategories.h

+#pragma once
+#ifndef LOGCATEGORIES_H
+#define LOGCATEGORIES_H
+
 #include <QLoggingCategory>
 
 Q_DECLARE_LOGGING_CATEGORY(log_subdiv)
 Q_DECLARE_LOGGING_CATEGORY(log_mesh)
+
+#endif