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contrib: dav1d: update to 1.4.2

Tristan Matthews requested to merge tmatth/vlc:contrib/dav1d-1.4.2 into master

Changes for 1.4.2 'Road Runner':

1.4.2 is a small release of dav1d, improving notably ARM, AVX-512 and PowerPC

  • AVX2 optimizations for 8-tap and new variants for 6-tap
  • AVX-512 optimizations for 8-tap and new variants for 6-tap
  • Improve entropy decoding on ARM64
  • New ARM64 optimizations for convolutions based on DotProd extension
  • New ARM64 optimizations for convolutions based on i8mm extension
  • New ARM64 optimizations for subpel and prep filters for i8mm

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