x.py refers to skip-build, which is missing from config.example.toml

[dilyanpalauzov]

rustc-1.81.0-src/x.py --help prints

     --llvm-skip-rebuild <VALUE>
          whether rebuilding llvm should be skipped, overriding `skip-rebuld` in config.toml
          
          [possible values: true, false]

This suggests, that config.example.toml has a skip-rebuild parameter. But it does not.

#71119 suggests to skip rebuilding LLVM by calling ./configure --llvm-root=<path>.

• Either reword the above output, or add skip-rebuild in config,example.toml.

[dilyanpalauzov]

It really says skip-rebuld and not skip-rebuild and both are missing from config.example.toml.

[onur-ozkan]

This --llvm-skip-rebuild flag is no longer used anywhere, and we don't support that skip-rebuild option in config.toml.

Mentoring instructions: remove the llvm_skip_rebuild from bootstrap, then run x.py test tidy --bless to update the shell completion files.