Core: Build wheels for the appropriate architecture on OSx devices

[mawildoer]

On OSx, the architecture mightn't be reliably auto-detected because Macs try to abstract some of the hard stuff.

This PR explicitly detects and adds a build flag for the right architecture on OSx.
Additionally, it adds logging of the stderr stream on failures for debugging

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• I have added tests that prove my fix is effective or that my feature works (if applicable)
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[iopapamanoglou]

Great find!