libavif v1.4.2 release

[Wan-Teh Chang]

Hello everyone,

libavif v1.4.2 has been released. The source code of the release can
be checked out from the git repository[1] using the release tag
v1.4.2.

[1] https://github.com/AOMediaCodec/libavif.git

Here is the change log:

1.4.2 - 2026-05-26

Added since 1.4.1

* Add --jobs flag to avifgainmaputil to use multiple worker threads when
reading/writing AVIF files.

Changed since 1.4.1

* Require C11 for compilation. Public headers will remain C99.
* Add --jobs flag to avifgainmaputil and enable auto tiling.
* Use AOM_TUNE_IQ for layered image inter-frame encoding.
* Update aom.cmd/LocalAom.cmake: v3.14.1
* Update LocalAvm.cmake: research-v15.0.0
* Update libjpeg.cmd/LocalJpeg.cmake: 3.1.4.1
* Update libxml2.cmd/LocalLibXml2.cmake: v2.15.3
* Update libyuv.cmd/LocalLibyuv.cmake: 644251f25 (1924)
* Update svt.cmd/svt.sh/LocalSvt.cmake: v4.1.0
* Update zlibpng.cmd/LocalZlibpng.cmake: libpng 1.6.58
* Fix memory leak of altICC if avifDecoderFindGainMapItem returns early.
* Avoid MT loop restoration crash in libaom < 3.13.3
* Fix decoding layered image with multiple scaled alpha layers
* Fix NaN bypass of AVIF_CLAMP in gain map tone mapping (use fminf/fmaxf)
* Fix null pointer dereference in avifImageCopy() when avifImageCreateEmpty()
fails to allocate the destination gain map image.
* avifenc: reject mismatched --depth for Y4M input
* Use libaom AOMD_SET_FRAME_SIZE_LIMIT if available
* Fix bug in transfer function 11 (used for gain map creation/tone mapping)

https://github.com/AOMediaCodec/libavif/compare/v1.4.1...v1.4.2