oe/path.py: copyhardlinktree: don't overwrite existing symlinks
Before GNU tar 1.24, only the archive creation command had the '-h'
argument to preserve and follow symlinks. After >= 1.24 via commit
14efeb9f956e38d7be (tar: --dereference consistency) the capability to
preserve symlinks was also added to the archive extraction command.
-h is default at archive creation but is not default at extraction,
meaning that it will replace symlinks with directories even if the
original filesystem directory tree and archive contains them.
Add -h to the copyhardlinktree extraction step so the build can
support symlinks in variables like ${DEPLOY_DIR_IPK/RPM/DEB}.
Signed-off-by: Ioan-Adrian Ratiu <adrian.ratiu@ni.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
