Log Message:
libwebp: updated to 1.5.0

version 1.5.0
This is a binary compatible release.
API changes:
  - `cross_color_transform_bits` added to WebPAuxStats
* minor lossless encoder speed and compression improvements
* lossless encoding does not use floats anymore
* additional Arm optimizations for lossy & lossless + general code generation
  improvements
* improvements to WASM performance
* improvements and corrections in webp-container-spec.txt and
  webp-lossless-bitstream-spec.txt
* further security related hardening and increased fuzzing coverage w/fuzztest
* miscellaneous warning, bug & build fixes
Tool updates:
  * gif2webp: add -sharp_yuv & -near_lossless
  * img2webp: add -exact & -noexact
  * exit codes normalized; running an example program with no
    arguments will output its help and exit with an error