Install rustup from submodule again#1118
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This reverts google#1074. This is not done for hermetic builds but for source integrity.
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This pull request integrates rustup as a git submodule (third_party/rust-lang/rustup) and updates the setup, sync, and upgrade scripts to use this local copy instead of downloading it directly. Feedback on these changes includes initializing RUSTUP_ARGS in scripts/setup.sh to prevent environment leakage, replacing a non-portable GNU sed extension in scripts/sync.sh with a portable pattern for BSD/macOS compatibility, and avoiding the use of eval by executing the static curl command directly.
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This reverts #1074.
This is not done for hermetic builds but for source integrity.