refactor(Qt): use 'storeRelaxed()' and 'loadRelaxed()'

This fixes build with Qt 5.14 by replacing the deprecated
QAtomic::load() and store() functions with the new ones.

- https://code.qt.io/cgit/qt/qtbase.git/commit/?h=5.14&id=79bdc7cf

src/main.cpp

@@ -75,10 +75,18 @@ void cleanup()
     qDebug() << "Cleanup success";
 
 #ifdef LOG_TO_FILE
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 14, 0))
+    FILE* f = logFileFile.loadRelaxed();
+#else
     FILE* f = logFileFile.load();
+#endif
     if (f != nullptr) {
         fclose(f);
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 14, 0))
+        logFileFile.storeRelaxed(nullptr); // atomically disable logging to file
+#else
         logFileFile.store(nullptr); // atomically disable logging to file
+#endif
     }
 #endif
 }
@@ -128,7 +136,11 @@ void logMessageHandler(QtMsgType type, const QMessageLogContext& ctxt, const QSt
     fwrite(LogMsgBytes.constData(), 1, LogMsgBytes.size(), stderr);
 
 #ifdef LOG_TO_FILE
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 14, 0))
+    FILE* logFilePtr = logFileFile.loadRelaxed(); // atomically load the file pointer
+#else
     FILE* logFilePtr = logFileFile.load(); // atomically load the file pointer
+#endif
     if (!logFilePtr) {
         logBufferMutex->lock();
         if (logBuffer)
@@ -282,7 +294,11 @@ int main(int argc, char* argv[])
     if (!mainLogFilePtr)
         qCritical() << "Couldn't open logfile" << logfile;
 
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 14, 0))
+    logFileFile.storeRelaxed(mainLogFilePtr); // atomically set the logFile
+#else
     logFileFile.store(mainLogFilePtr); // atomically set the logFile
+#endif
 #endif
 
     // Windows platform plugins DLL hell fix