Dongsu Park b13976285e build_library: deal with both virtual/rust and dev-lang/rust
Toolchain utils have installed only `dev-lang/rust`. It could result
in version mismatch between `virtual/rust` and `dev-lang/rust`, because
`dev-lang/rust` does not automatically pull in `virtual/rust`.

So install `virtual/rust` instead of `dev-lang/rust`.
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