Attempt to fix Arm OSX migrator with native build

[mattpitkin]

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.

[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.

[demorest]

hi Matt, reminder to please see my comments on PR #13 . Even if you can get the ARM native build compiling I believe there will be issues due to lack of precision (ie, long doubles only have double precision), unless larger changes are made to the tempo2 code.