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>

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