bootstrap: expand '@argfile' arguments to rustc shim When cargo invokes `rustc`, if the command line exceeds some system defined limit, `cargo` will try again and pass the arguments in an argfile. When the bootstrap rustc shim tries to detect `--target`, it does not account for `@argfile` arguments. As a result, the shim doesn't find `--target` and incorrectly sets `is_build_script` to true, as well as passing the `RUSTC_HOST_FLAGS` to the underlying compiler This PR makes the shim read all the arguments from every `@argfile`. Previous work already updated the shim to use `ArgFileCommand` to pass arguments down to the underlying `rustc`.
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