Packages fail to precompile on musl system

[ii8]

I came across this while trying to use Makie, here is the full log: makieerrors.txt And here is the original issue on the Makie repo: https://github.com/MakieOrg/Makie.jl/issues/3725

There are a couple of issues I think, libiconv.so is assumed to exist on musl systems and the FFMPEG package has an exploding dependencies problem so completely unrelated things like Xorg_libXext_jll end up getting pulled into the environment.