Different behaviours in Linux and MacOs with Julia embedded in C++

General Usage
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As I understand it, build_sysimg.jl is moderately broken on >= 0.7. See Fix `contrib/build_sysimg.jl` by staticfloat · Pull Request #27629 · JuliaLang/julia · GitHub for a proposed fix, but note the last comment:

I think we should just remove contrib/build_sysimg.jl and tell users to use PackageCompiler.jl instead. All in favor?