Rollup merge of #147120 - Shunpoco:issue-147105, r=Kobzol

Fix --extra-checks=spellcheck to prevent cargo install every time

Fixes rust-lang/rust#147105

## Background
Current implementation of `ensure_version_of_cargo_install` uses `bin_name` to check if it exists, but it should use `<tool_root_dir>/<tool_bin_dir>/<bin_name>` instead. Otherwise the check fails every time, hence the function falls back to install the binary.

## Change
Move lines which define bin_path at the top of the function, and use bin_path for the check

Author: matthiaskrgr