Remove PROTECT_VECTORS option since either program is correct without locking or it is not, especially since std::vector is definitely not thread-safe on all major platforms.

rtgui/batchqueueentry.cc

@@ -244,10 +244,7 @@ void BatchQueueEntry::_updateImage (guint8* img, int w, int h)
 {
 
     if (preh == h) {
-
-#if PROTECT_VECTORS
         MYWRITERLOCK(l, lockRW);
-#endif
 
         prew = w;
         assert (preview == NULL);