update to v1.2.1

Just a small bug fix release; some overflow fixes related to
cropping/scaling are relevant for skia.

- 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)

Bug: 188435220
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: I01bf93885447fdba1bc8f3874eb35869423e39b1
57 files changed