Commit 4821cfbb for libheif

commit 4821cfbb15cf9973c5b98edfa7c7b6e4c608af92
Merge: 7afd4404 42b058a3
Author: Dirk Farin <dirk.farin@gmail.com>
Date:   Fri Dec 26 13:32:19 2025 +0100

    Merge pull request #1644 from dukesook/unc_signed_intenger

    Uncompressed Signed Integer