Enable BUILD_LIBRARY_FOR_DISTRIBUTION

[leon-misfit]

I was trying to use Carthage to integrate Eureka, but got a swift complier compatible error

Please Set BUILD_LIBRARY_FOR_DISTRIBUTION = YES; so there won't generate swift complier compatible error like "Module compiled with Swift 5.6.1 cannot be imported by the Swift 5.8 compiler"

See https://stackoverflow.com/questions/58654714/module-compiled-with-swift-5-1-cannot-be-imported-by-the-swift-5-1-2-compiler