100l, add missing enum type, fix compilation

Originally committed as revision 16495 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/mxf.h

@@ -41,6 +41,7 @@ enum MXFMetadataSetType {
     Identification,
     ContentStorage,
     SubDescriptor,
+    IndexTableSegment,
     TypeBottom,// add metadata type before this
 };