If you build nativesdk for machine A, then change to B you will see sstate
manifest warnings for the packagedata files. The stamps are machine
specific and should not be, ditto for native.
This patch copies the populate-sysroot extra stamp entries to avoid
these warnings.
(From OE-Core rev: a64de25d6006ec6dd777d8f3820a48244dfbf62b)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>