libwebp-1.2.1

- 7/20/2021: version 1.2.1
  This is a binary compatible release.
  * minor lossless encoder improvements and x86 color conversion speed up
  * add ARM64 simulator support to xcframeworkbuild.sh (#510)
  * further security related hardening in libwebp & examples
    (issues: #497, #508, #518)
    (chromium: #1196480, #1196773, #1196775, #1196777, #1196778, #1196850)
    (oss-fuzz: #28658, #28978)
  * toolchain updates and bug fixes (#498, #501, #502, #504, #505, #506, #509,
                                     #533)
  * use more inclusive language within the source (#507)
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