Commit 62f1b8c7 for libheif

commit 62f1b8c76ed4d8305071fdacbe74ef9717bacac5
Author: Dirk Farin <dirk.farin@gmail.com>
Date:   Thu Jan 15 17:00:18 2026 +0100

    make 'cmpd' an essential property (#1589)

diff --git a/libheif/codecs/uncompressed/unc_boxes.h b/libheif/codecs/uncompressed/unc_boxes.h
index 79bdd4eb..a97265b6 100644
--- a/libheif/codecs/uncompressed/unc_boxes.h
+++ b/libheif/codecs/uncompressed/unc_boxes.h
@@ -48,6 +48,8 @@ public:

   Error write(StreamWriter& writer) const override;

+  bool is_essential() const override { return true; }
+
   struct Component
   {
     uint16_t component_type;