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The stable version of the cargo-cross tool uses an Ubuntu version with an ancient LLVM version which is too old for cbindgen, and newer cargo-cross versions are broken in other ways. So switch to building the cross-compilation environment from scratch.
Note that this is a dependency for making cross-builds using the
boringcrate work (which is needed for #2080), just splitting the change into its own PR to make it easier to debug build failures and review.