This contains references to various external repositories which are known to
build and work properly with the current libavif. If you are building for
Windows or any kind of fully static (embedded) release, using these scripts in
conjunction with the BUILD_SHARED_LIBS=0 and AVIF_LOCAL_* CMake flags make
for a convenient way to get all of the dependencies necessary. This method is
how many of libavif's continuous builders work.
However, if you are building this for a distribution or Unix-like environment
in general, you can safely ignore this directory. Allow BUILD_SHARED_LIBS
to keep its default (ON), enable the appropriate AVIF_BUILD_* CMake flags
depending on which shared AV1 codec libraries you plan to leverage and depend
on, and use the system's zlib and libpng.