Deduplicated files are reparse points with IO_REPARSE_TAG_DEDUP tag. Such
files are created by a dedup service running in the background, so a regular
file may be converted to a dedup reparse point at any time and without user's
intervention. For all intents and purposes dedup files should look like
normal, regular files, so it makes sense to report them as such in
Boost.Filesystem methods like status(), symlink_status() and everything
based on those. This commit implements this.
Closes https://github.com/boostorg/filesystem/issues/262.
141727b568