Migrate `sysroot_*` to `{{ stdlib('c') }}`

[jakirkham]

Follows up on this suggestion ( https://github.com/conda-forge/openmpi-feedstock/pull/147#pullrequestreview-1984041142 ), to align with broader move away from sysroot_* to {{ stdlib('c') }} ( https://github.com/conda-forge/conda-forge.github.io/issues/2102 )

cc @beckermr

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Checklist

• [x] Used a personal fork of the feedstock to propose changes
• [x] Bumped the build number (if the version is unchanged)
• [ ] Reset the build number to 0 (if the version changed)
• [x] Re-rendered with the latest conda-smithy (Use the phrase code>@<space/conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• [x] Ensured the license file is being packaged.

[conda-forge-webservices[bot]]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe) and found it was in an excellent condition.

[jakirkham]

@conda-forge-admin, please re-render

[github-actions[bot]]

Hi! This is the friendly automated conda-forge-webservice.

I tried to rerender for you, but it looks like there was nothing to do.

This message was generated by GitHub actions workflow run https://github.com/conda-forge/openmpi-feedstock/actions/runs/8622718322.

[jakirkham]

Thanks Axel! 🙏

Was looking for reviews from folks like yourself 🙂

[dalcinl]

@jakirkham Looks like this one is ready. Should we merge?

[jakirkham]

If it looks good, please feel free to merge

[jakirkham]

Thanks all! 🙏