cerbero: Remove rust prefix before installing rust toolchain
Otherwise in-place updates will be broken, because rustup-init will try to install every target that exists in the prefix, not just the one we want to install.
Fixes #465 (closed)
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Otherwise in-place updates will be broken, because rustup-init will try to install every target that exists in the prefix, not just the one we want to install.
Fixes #465 (closed)