Use a dynamic library in a swift package on Linux

[lukasa (Cory Benfield)]

@hassila

I do agree there's a challenge with the question of communication, but with a simple model it is easier (and perhaps the platform tuple could be complemented with a more specific exact platform we are using) to just say 'the platforms must match exactly, otherwise it will not work

I think the issue there is that "the platforms must match exactly" is extremely difficult to express. This implies the same distort, with the same set of installed dependent packages, at the same or later version. I honestly don't know how we'd express that.

My note about "the right way" is at Binary dependencies on Linux.