Log Message:
libwebp: updated to 1.2.3

version 1.2.3
This is a binary compatible release.
* security fix for lossless encoder
* improved progress granularity in WebPReportProgress() when using lossless
* improved precision in Sharp YUV (-sharp_yuv) conversion
* many corrections to webp-lossless-bitstream-spec.txt
* crash/leak fixes on error/OOM and other bug fixes