Add test to build crates used by r-a on stable

[lqd]

r? @Kobzol

This integrates #129526 until it lands, and I cherry-picked your commit, and added the last remaining pieces we needed I think.

Draft to discuss if need be.

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[rustbot]

r? @jieyouxu

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[lqd]

I've also removed the cargo nightly feature / RUSTC_BOOTSTRAP

[lqd]

All the prerequisite PRs have landed.

[rustbot]

This PR modifies tests/run-make/. If this PR is trying to port a Makefile run-make test to use rmake.rs, please update the run-make port tracking issue so we can track our progress. You can either modify the tracking issue directly, or you can comment on the tracking issue and link this PR.

cc @jieyouxu

The run-make-support library was changed

cc @jieyouxu

[Kobzol]

Thanks! You can r=me once CI is green.

[Kobzol]

@bors r+

[bors]

:pushpin: Commit a178559a03a11b5f6e716045e1b486ca29b2d543 has been approved by Kobzol

It is now in the queue for this repository.

[Veykril]

A very late thanks for this test btw :)