The upgrade of libgit2 to 0.99.0 seems to have broken this

julia bin/install_packages.jl
Activating environment at `~/workspace/LMGPU.jl/Project.toml`
   Cloning default registries into `~/.julia`
   Cloning registry from "https://github.com/JuliaRegistries/General.git"
ERROR: LoadError: failed to clone from https://github.com/JuliaRegistries/General.git, error: GitError(Code:ERROR, Class:Invalid, invalid version 0 on git_proxy_options)

Other bug reports from other libgit2 version bumps suggest using an
older version of libgit2


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Efraim Flashner   <efraim@flashner.co.il>   אפרים פלשנר
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