Draft: Build wheels instead of using manually bundled cbc

[sebheger]

No description provided.

[tkralphs]

Hmm, I guess that what's happening is that because python-mip doesn't actually build a proper C extension, but only accesses the built library directly through cffi, the Cbc libraries are not being picked up as dependencies and packaged as they should be. Looks like some more research is needed to see how to package libraries that are accessed through cffi. I guess this should be possible, but it's apparently not quite as easy as just using the same workflow as CyLP.

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