update to 1.2.2 branch (69c7f16)

Just a small bug fix release.

https://chromium.googlesource.com/webm/libwebp/+log/v1.2.1..69c7f16

- 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)

Bug: 202302177
Bug: https://crbug.com/webp/541
Test: sargo_hwasan arm64/armv7 CtsGraphicsTestCases:include-filter:android.graphics.cts.Bitmap*
Test: sargo_hwasan arm64/armv7 CtsGraphicsTestCases:include-filter:android.graphics.cts.*ImageDecoder*
Test: builds for aosp_arm-eng aosp_arm64-eng aosp_x86-eng aosp_x86_64-eng aosp_crosshatch-userdebug

Change-Id: I28210ddc9b2b28e9a8b3bda13829851c74e9716f
30 files changed