Update standalone build tools section (backport #380)

[mergify]

This is an automatic backport of pull request #380 done by Mergify.
Cherry-pick of e13e64d has failed:

On branch mergify/bp/galactic/pr-380
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	both modified:   README.md

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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