libmatroska2: fix unique elements that can be recurring

Until there is a recurring flag in libebml2 (#92) we must assume the element is
ok multiple times.

Author: robUx4

libmatroska2/matroska_sem.c

@@ -975,12 +975,12 @@ const ebml_semantic EBML_SemanticTags[] = {
 
 const ebml_semantic EBML_SemanticSegment[] = {
     {0, 0, &MATROSKA_ContextSeekHead, 0},
-    {1, 1, &MATROSKA_ContextInfo, 0},
+    {1, 0, &MATROSKA_ContextInfo, 0},
     {0, 0, &MATROSKA_ContextCluster, 0},
-    {0, 1, &MATROSKA_ContextTracks, 0},
+    {0, 0, &MATROSKA_ContextTracks, 0},
     {0, 1, &MATROSKA_ContextCues, 0},
     {0, 1, &MATROSKA_ContextAttachments, PROFILE_WEBM},
-    {0, 1, &MATROSKA_ContextChapters, 0},
+    {0, 0, &MATROSKA_ContextChapters, 0},
     {0, 0, &MATROSKA_ContextTags, 0},
     {0, 0, NULL ,0} // end of the table
 };