Update zm_rtp_source.h

--- ZoneMinder-master/src/zm_rtp_source.h	Wed Sep 18 06:00:06 2013 UTC
+++ ZoneMinder-master.rtsp/src/zm_rtp_source.h	Tue Sep 24 11:51:42 2013 UTC
@@ -84,6 +84,7 @@
     Buffer mFrame;
     int mFrameCount;
     bool mFrameGood;
+    bool prevM;
     ThreadData<bool> mFrameReady;
     ThreadData<bool> mFrameProcessed;