This is a refresh of our current FFmpeg 5.0.0 (unchanged) version with the
following changes:
* libvpx all platforms: enable SSE3/4/AVX/AVX2 instruction sets. libvpx has a
proper CPUID check in place and will not call the faster kernels unless it is
sure the CPU supports it. So we can safely enable this, this partially
resolves T95743 (completely on Linux and macOS).
* libvpx Windows - threading was disabled due to a shared dependency on
libwinpthreads.dll which we prefer not to distribute. However when configure
cannot find pthreads it will happily fall back on a win32 threads based
emulation layer. This also resolves the final part of T95743.
* libaom-av1 - new dependency required for D14920, this is a somewhat odd
dependency, it's cmake based, but still needs the perl environment setup, so
we have to setup the env and call cmake our selves for the configure, build
and install commands. This dep has the same libwinpthreads issue as vpx on
Windows, however since it's cmake based, it's easier to prevent cmake from
detecting it.
Differential Revision: https://developer.blender.org/D15399
aa788b759a