Fix rdkit location on osx-arm64

[bkpoon]

Checklist

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

Fixes #120

This PR removes the PYTHON_INSTDIR cmake argument which was set to $SP_DIR. During cross-compiling, $SP_DIR was always set to 3.10 instead of the specific Python version for the build.

[conda-forge-webservices]

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.

[bkpoon]

@conda-forge-admin, please rerender

[github-actions]

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/rdkit-feedstock/actions/runs/3918294664.

[mcs07]

Awesome! This feels like a bug in conda-build? Although good to see that SP_DIR isn't actually needed.

[bkpoon]

Thanks! I think the issue has something with the cross-compiling process where some environment variables are not updated. It's something I'll try to look into once I find some time.