CLSA-2026-1775211239 openexr: Fix of 4 CVEs

CVE-2025-12495 CVE-2025-12839 CVE-2025-12840: fix heap buffer overflows in the C core decoding pipeline missing nread validation in exrreadchunk, missing packed/unpacked size check for uncompressed tiles, missing storagemode guard in chunk offset computation - CVE-2025-64181: fix use of...