Drop-in replacement for Swift dylib used in https://github.com/roife/emt
Since compile Emacs dynamic module written in Swift requires both Xcode and macOS 10.15 upwards, this is a replacement for those still use an older version of OS X (lowest requirement is 10.5) (However, for this particular module the NatrualLanguage framework used requires at least 10.14).
This also serves as a demonstration on how to using Objective-C directly for Emacs dynamic module.
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