MAINT Remove unused patch file

[lesteve]

Follow-up of #262. The patch was removed from meta.yaml but the file itself was not removed. I don't think this has any impact on the conda package, so I guess this is fine not updating the build number in this PR.

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.

[jjerphan]

LGTM. Thank you, @lesteve .

One can use [ci skip] as a title prefix to allow skipping the workflows.

[jakirkham]

Thanks all! 🙏