This package included a patch which accidently disabled the applications which
can only be built for 32-bit ARM on all platforms (including 32-bit ARM). There
is a newer version of the patch available in the upstream PR which can avoid
this problem, but I don't think the patch is truly necessary at all. We can
simply pass -DARM64=ON on all platforms except 32-bit ARM to get the same
effect.
libraspberrypi provided an empty directory. The during
https://github.com/NixOS/nixpkgs/pull/107637, this was refactored to use
cmakeFlags.
cmakeFlags can't use `$out` directly. `$out` is a bash variable, so to
use it there, `${placeholder "out"}` is needed, otherwise it'll
pick `"$out"` literally.
