[Cin] libaom 3.2.0

[Andrew Randrianasulu]

https://aomedia.googlesource.com/aom/+/refs/tags/v3.2.0/CHANGELOG

---
This release includes compression efficiency and perceptual quality
  improvements, speedup and memory optimizations, as well as some new
  features.
  - New Features
    * Introduced speeds 7, 8, and 9 for all intra mode.
    * Introduced speed 10 for real time mode.
    * Introduced an API that allows external partition decisions.
    * SVC: added support for compound prediction.
    * SVC: added support for fixed SVC modes.
  - Compression Efficiency Improvements
    * Intra-mode search improvement.
    * Improved real time (RT) mode BDrate savings by ~5% (RT speed 5)
      and ~12% (RT speed 6). The improvement was measured on the video
      conference set.
    * Improved real time mode for nonrd path (speed 7, 8, 9): BDrate
      gains of ~3-5%.
    * Rate control and RD adjustments based on ML research in VP9.
      Gains of ~0.5-1.0% for HD.
  - Perceptual Quality Improvements
    * Added a new mode --deltaq-mode=3 to improve perceptual quality
      based on a differential contrast model for still images.
    * Added a new mode –deltaq-mode=4 to improve perceptual quality
      based on user rated cq_level data set for still images.
    * Weighting of some intra mode and partition size choices to better
      manage and retain texture.
  - Speedup and Memory Optimizations
    * Further improved 2-pass good quality encoder speed:
      o Speed 2 speedup: 18%
      o Speed 3 speedup: 22%
      o Speed 4 speedup: 37%
      o Speed 5 speedup: 30%
      o Speed 6 speedup: 20%
    * Optimized the real time encoder (measured on the video conference
      set):
      o RT speed 5 speedup: 110%
      o RT speed 6 speedup: 77%
  - Bug Fixes
    * Issue 3069: Fix one-pass mode keyframe placement off-by-one error.
    * Issue 3156: Fix a bug in av1_quantize_lp AVX2 optimization.
---

I quickly re-packed .tar.gz into xz and renamed libaom patches accordingly.
It seems to work with ffmpeg-4.4.

Phyllis, can you test (may be next month?) if libaom-3.2.0 still works on
both new and old distros (as you use them for appimage build)?

Also, ffmpeg 4.4.1 was released - mostly bugfixes from fuzzers, it seems,
but also few changes in util

https://git.ffmpeg.org/gitweb/ffmpeg.git/blob/7e0d640edf6c3eee1816b105c2f7498c4f948e74:/Changelog

https://git.ffmpeg.org/gitweb/ffmpeg.git/tag/2aa4f5cc8be5e3168191cd13a61178a167687eac
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