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replay: Fix handling of directory symlink in external

Antoine Lambert requested to merge generated-differential-D7402-source into generated-differential-D7402-target

As we use distutils.dir_util.copy_tree to copy an external exported in a cache directory to the reconstructed filesystem of the subversion repository, we need to ensure sub-directories of the external will exist in the destination path to avoid copy errors.

However, if a sub-directory is a symlink, we must not create the directory in the destination path as copy_tree will fail attempting to recreate the symlink.

Fixes SWH-LOADER-SVN-71

Migrated from D7402 (view on Phabricator)

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