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Document the usage of `TARGET_` env vars
We use some env vars to configure the target OS, architecture and ABI. This is needed to support Nerves, as they set those env vars in the build/compilation process.
We need to document this usage, since more systems can benefit from that.
Here are the docs from Nerves: https://hexdocs.pm/nerves/compiling-non-beam-code.html#target-cpu-arch-os-and-abi