matroskadec: add needed definitions forgotten in r17331

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@17332 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavformat/matroska.h

@@ -149,6 +149,11 @@
 #define MATROSKA_ID_TAGLANG             0x447A
 #define MATROSKA_ID_TAGDEFAULT          0x44B4
 #define MATROSKA_ID_TAGTARGETS          0x63C0
+#define MATROSKA_ID_TAGTARGETS_TYPE       0x63CA
+#define MATROSKA_ID_TAGTARGETS_TYPEVALUE  0x68CA
+#define MATROSKA_ID_TAGTARGETS_TRACKUID   0x63C5
+#define MATROSKA_ID_TAGTARGETS_CHAPTERUID 0x63C4
+#define MATROSKA_ID_TAGTARGETS_ATTACHUID  0x63C6
 
 /* IDs in the seekhead master */
 #define MATROSKA_ID_SEEKENTRY  0x4DBB