Fix build error after clean build.
Fix build error after clean build.

Got the error message

  "/Users/karemorstol/Library/Developer/Xcode/DerivedData/FootlessParser-etlxehbktklumbbodjsayvyitpfx/Build/Intermediates/FootlessParser.build/Debug/FootlessParser-Mac.build/module.modulemap:2:12: Header 'FootlessParser-Swift.h' not found"

after doing a clean build. Apparently that happens if you try to import a Swift framework from within itself. I would rather not disclose how long it took me to figure this out :|

kareman/FootlessParser,kareman/FootlessParser