Try to fix most warnings in the OBS builds (#4284)

rtgui/batchqueue.cc

@@ -373,7 +373,7 @@ Glib::ustring BatchQueue::getTempFilenameForParams( const Glib::ustring &filenam
 {
     timeval tv;
     gettimeofday(&tv, nullptr);
-    char mseconds[4];
+    char mseconds[11];
     sprintf(mseconds, "%d", (int)(tv.tv_usec / 1000));
     time_t rawtime;
     struct tm *timeinfo;