Fix libdispatch Swift module directory

Author: Julian Lettner

test/lit.cfg

@@ -1021,7 +1021,7 @@ elif (run_os in ['linux-gnu', 'linux-gnueabihf', 'freebsd', 'windows-cygnus', 'w
     config.target_swift_autolink_extract = inferSwiftBinary("swift-autolink-extract")
 
     libdispatch_artifact_dir = config.libdispatch_build_path
-    libdispatch_swift_module_dir = make_path(libdispatch_artifact_dir, 'src', 'swift')
+    libdispatch_swift_module_dir = make_path(libdispatch_artifact_dir, 'src', 'swift', 'swift')
     libdispatch_artifacts = [
         make_path(libdispatch_artifact_dir, 'libdispatch.so'),
         make_path(libdispatch_artifact_dir, 'libswiftDispatch.so'),