libwebp-1.2.4

- 8/4/2022: version 1.2.4
  This is a binary compatible release.
  * restore CMake libwebpmux target name for compatibility with 1.2.2 (#575)
  * fix lossless crunch mode encoding with WEBP_REDUCE_SIZE
    (chromium: #1345547, #1345595, #1345772, #1345804)
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