libwebp-1.2.2

- 1/11/2022: version 1.2.2
  This is a binary compatible release.
  * webpmux: add "-set bgcolor A,R,G,B"
  * add ARM64 NEON support for MSVC builds (#539)
  * fix duplicate include error in Xcode when using multiple XCFrameworks in a
    project (#542)
  * doc updates and bug fixes (#538, #544, #548, #550)
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