package: Fix race between do_package and do_packagedata
do_package has PKGDESTWORK as a cleandir and do_packagedata has it as an sstate-input
dir. This means do_package wipes out the directory at both do_package and do_package_setscene.
do_package_setscene and do_packagedata_setscene can run in parallel when installing from
sstate which means they can wipe out parts of each other leading to interesting
build failures.
We therefore have to add in a hardlink copy so that the directories can work independently
of each other.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
