fix format-security on Q_OS_MAC

Author: nim65s

generator/main.cpp

@@ -96,7 +96,7 @@ namespace
         QString reason = "The QTDIR environment variable " + qtdir.isEmpty() ?
                          "is not set. " : "points to a non-existing directory. ";
 #if defined(Q_OS_MAC)
-        qWarning((reason + "Assuming standard binary install using frameworks.").toUtf8().constData());
+        qWarning() << reason << "Assuming standard binary install using frameworks.";
             QString frameworkDir = "/Library/Frameworks";
             includes << (frameworkDir + "/QtXml.framework/Headers");
             includes << (frameworkDir + "/QtNetwork.framework/Headers");