Libonnx 1.15 (but forked from working version)

[hmaarrfk]

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.

[cbourjau]

Is this still something you want to pursue, @hmaarrfk ? Please note that the onnx library does not offer a stable C-API so whatever project that were to consume the shared library could only use it with a version pin in practice.

[hmaarrfk]

Thanks for the note

in an ideal world. I would still like to attempt this. It would be good to have a centrally optimized build for onnx