Fix osx-arm64 signature

[xhochy]

clang_bootstrap_osx-arm64 is currently broken on conda-forge as the linker has an invalid signature. Building it locally, it does produce a valid signature. Thus I suspect that it is missing the correct cctools somewhere as a requirement. I'll use this PR here to test CI.

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)
• [ ] Ensured the license file is being packaged.

[conda-forge-linter]

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.

[xhochy]

One clearly suspicous observation: Locally, I see cctools log messages while clang_bootstap is packaged. These don't appear in CI here.

[xhochy]

Using the built artefacts here, tests pass locally, weird.

[xhochy]

Closing in favor of #79