image-prelink: remove assumption of sysconfdir presence
If sysconfdir is not present in the image filesystem then the temporary
creation of a prelink.conf will fail. Fix this by creating sysconfdir
temporarily if needed beforehand and then remove any directories that
were created afterwards.
fixes: OpenXT OXT-1751
Signed-off-by: Christopher Clark <christopher.w.clark@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
